Questions about different lens material, improving eyesight, etc.

Discussion in 'Eye-Care' started by midwest_46, Jan 29, 2007.

  1. midwest_46

    midwest_46 Guest

    Hello. This post is a little long, and I apologize for the
    inconvenience. Some of the stuff that I mention in this post is stuff
    that I have already mentioned in a previous post very recently.
    However, I must mention it again as background information for my new
    questions. For those who read my earlier post, I apologize for the
    repetition.

    ----------

    I am a 33-year-old male.
    Prior to 1997, I wore glasses that were -4.25 in the left eye and -4
    in the right eye.

    In 1997, my eye doctor said that my eyesight was -5, -5. So, I started
    wearing -5 glasses for driving, seeing movies in a theater, etc., and
    I used the -4.25, -4 glasses for computers, reading, etc.

    In 2004, my doctor said that my eyesight was -5.25, -5.25. So, I
    started wearing -5.25, -5.25 glasses for driving, and I continued to
    use the -4.25, -4 glasses for reading, computers, etc. Also, I
    continued to use the -5 glasses for the movie theater.

    ----------

    In late 2006, my eye doctor said that my eyesight is currently -5.125,
    -5.125. He said that my eyesight is fluctuating between -5 and -5.25.

    He said that, for driving and the movie theater, I could use either
    the -5 glasses or the -5.25 glasses (my choice). For reading and
    computer use, he said that I could use -4, -4 glasses or -4.25, -4.25
    glasses (again, my choice).

    ----------

    Well, unfortunately, shortly after the eye exam of late 2006, I lost
    my -5 glasses. In 2004, I had bought the -5.25 glasses at
    Lenscrafters, and the material of the -5.25 lenses was comfortable for
    me. So, I bought new -5 glasses at Lenscrafters, and I wanted the
    exact same material for these new lenses.

    The people at Lenscrafters have told me that the -5.25 lenses are
    "photo flextint plastic", and the -5 lenses that Lenscrafters sold me
    were made from "photo mid-index plastic". Lenscrafters said that
    "photo flextint plastic" and "photo mid-index plastic" are the same
    thing.

    ----------

    Well, I tried wearing the new -5 glasses at a movie theater. I thought
    that these glasses would be as comfortable as the -5.25 glasses (since
    both pairs of glasses were of the same material). However, the -5
    glasses produced something of a strain.

    Lenscrafters told me that I have to get used to the new -5 glasses and
    that I should wear them as much as possible. Well, since my eye doctor
    said that my eyesight had improved from -5.25 to -5.125, I thought
    that I could wear the new -5 glasses more often and improve my
    eyesight even more. In other words, I would wear the -5 glasses, not
    just for the theater, but also for driving. However, even though I've
    worn them more often, I still feel some strain from time to time.
    Putting on the -5.25 glasses alleviates the strain. So, how long
    should it take me to get used to the -5 glasses? Have I already gotten
    too used to the -5.25 glasses, such that the -5.25 glasses are
    comfortable and the -5 glasses produce a strain? Also, if I keep
    wearing the -5 glasses, will my eyesight keep improving?

    Furthermore, when I bought the new -5 glasses, Lenscrafters did NOT
    measure my pupil distance, whereas Lenscrafters had measured the pupil
    distance in 2004 for the -5.25 glasses. When I bought the -5 glasses,
    the guy at Lenscrafters told me that pupil distance was useless,
    misleading, etc. So, is measuring pupil distance important?

    Thanks for any information.
     
    midwest_46, Jan 29, 2007
    #1
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  2. midwest_46

    Mark A Guest

    Measuring PD is very important, and is absolutely critical if the lens
    design is aspheric, which might have been dispensed for your moderately high
    Rx. Aspheric is the design of the lens, and not necessarily the material.

    Unfortunately, Lenscrafters rebrands their lenses so that it is very
    difficult for consumers to comparison shop the same items at other stores.
    So the terms they use for their lenses usually do not apply to anyone else,
    even if they are just renaming another manufacturer's product. However, from
    what I can determine, the Flextints are 1.56 index type of transition lens,
    which gets darker when you are outside in the sun. They may be Essilor
    Transitions Ormex 1.55 index (no guarantee that I am correct). But I have
    also heard that Lenscrafters no longer carries Transition branded products,
    so what you got may have been a knock off (and much lower quality) of the
    real stuff you got before.

    Since Lenscrafters offers a 30-day unconditional money back guarantee, I
    suggest that return your lens and get a refund. Do not purchase any lenses
    unless the optician can tell you the exact manufacturer and model of the
    lens (not just their internal branded name).
     
    Mark A, Jan 29, 2007
    #2
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  3. midwest_46

    midwest_46 Guest

    The lenses I bought in 2004 (-5.25) are, indeed, transition lenses.
    They do get darker when I am outside in the sun. Is "transition" the
    brand name given by the manufacturer? Is "flextint" the brand name
    given by Lenscrafters?


    The lenses I bought recently (-5) also get darker when I am outside in
    the sun. Wouldn't my -5 lenses also be "transition" lenses? Or are the
    new -5 lenses some cheap knockoff of the "transition" brand name?



    If I ask Lenscrafters to tell me the exact manufacturer and model of
    the lenses I bought in 2004 and of the lenses I bought recently, is
    Lenscrafters obligated to tell me? If Lenscrafters does not give me
    the information, is there any way in which I can find out
    independently?
     
    midwest_46, Jan 30, 2007
    #3
  4. midwest_46

    midwest_46 Guest


    By 2004, the old -5 glasses had become too weak for driving. So, I got
    an eye exam. The exam revealed that my eyesight was -5.25, -5.25. So,
    I started using the -5.25 glasses for driving and continued to use the
    -5 glasses for the theater.

    at all. He simply took the frames that were in the store display
    (Brooks Brothers model 363), had me wear the frames, saw that they
    fit, and said that the frames that I would have would be based on the
    display frames.

    However, I just spoke to a different person at that Lenscrafters
    store, and this person told me that my 2004 PD was used. So, now I'm
    not sure what is going on.



    By "strain", I mean some headaches, possibly minor headaches, near my
    eyes.

    What are "vertical placement" errors?


    But, if the glasses are not comfortable, is the discomfort only
    temporary? I would hate to return the glasses after only 30 days if
    the discomfort will go away in, say, 90 days.

    My doctor (if I understand him correctly) said that my eyesight
    improved from -5.25 (in 2004) to -5.125 (in 2006). So, if I use the -5
    glasses instead of the -5.25 glasses for the theater AND driving, will
    my eyesight improve even more?
     
    midwest_46, Jan 30, 2007
    #4
  5. midwest_46

    midwest_46 Guest


    Well, there is a doctor who practices in Chicago who *does* under-
    prescribe. This doctor is Harry Sirota.

    On June 13, 2006, the Chicago Tribune published an article on him.


    The following few paragraphs of the article describe the "under-
    prescribing" :

    <<<<
    The exam takes an unexpected turn when it comes time to choose the
    correct lens strength. After using the retinoscope, Sirota asks the
    patient to try on a variety of lenses, asking which "feels" best. With
    their eyes closed.

    "It's easier for the patient to know how the lenses feel with their
    eyes closed," he says. "With the eyes open, the patients use their
    intellect." With the eyes closed, light enters the eye though the
    eyelids, he says, and patients can sense what is most comfortable.

    "I think that there would be no value to testing lenses with the eyes
    closed," Augsburger says. "This would provide no additional
    information which the optometrist could use to write a final
    prescription."

    The prescription Dr. Sirota provides is almost always much weaker than
    any previously prescribed standard lenses. This proves disconcerting,
    even infuriating, to his patients when they first try on their new
    glasses. "They all hate it at first," he says.

    `I was reborn," says Leo Weese, a general contractor from Denver, of
    the first day he wore a pair of Sirota-prescribed lenses. Weese, who
    had worn glasses since age 2, describes experiencing a vivid new
    clarity and depth perception and becoming instantly aware of the
    "beauty and life in everything." Now 58, "I'm integrated seamlessly
    into what's going on around me. I'm not putting out fires; I'm ahead
    of the game." And, he adds, "my golf game got incredible."


    Here is the full article, which I got from a website in the google
    cache:


    A different vision
    Optometrist helps patients see the light about old traumas to improve
    eyesight

    Published June 13, 2006 - Chicago Tribune

    The optometrist was in his office, on the phone.

    On the other end was a woman whose husband was scheduled for glaucoma
    surgery the next day, and she was frantic, looking for a last-minute
    second opinion. The doctor, who had not treated the man before,
    listened carefully and then asked a series of questions:

    "Did he ever tell you what went on in his life when he was younger?"

    "What was his relationship with his father?"

    "Did he forgive his father?"

    For more than 50 years, Dr. Harry Sirota has been practicing optometry
    from the same unremarkable-looking storefront in Chicago's Uptown
    neighborhood. The unadorned window holds only a few plants and a sign
    that reads, "vision therapy." The plywood-paneled waiting room
    contains a handful of orange plastic chairs, piles of magazines and
    tottering stacks of mail.

    It is an unlikely destination, yet patients from around the country
    travel here for Sirota's own particular brand of optometry.

    Sirota does not see himself as a technician who, after conducting a
    series of tests, provides patients with corrective eyeglasses.
    Instead, he says, "I work with individuals with emotional problems
    that cause eye problems."

    "Emotions have the biggest effect on the eyes," he stresses. "When I
    look at someone's retina, what I see is how they chose to survive."

    Harry Sirota is an unlikely proponent of the unorthodox method he has
    developed. Born and raised in New York City, he came to Chicago to
    study at the Chicago College of Optometry (later the Illinois College
    of Optometry) for a career his father favored. There he learned the
    standard method of optometry, which meant fitting patients with lenses
    that provided 20/20 sight.

    It was while working at the school clinic that he says he started to
    notice the complaints of those being fitted for glasses. Many patients
    said they just did not feel comfortable with their new glasses. The
    instructors' response was invariably the same: "Tell them they'll get
    used to them!"

    After serving in the Army, Sirota settled here and soon rented the
    office on North Sheridan Road. He decided to try to discover why so
    many of his patients said they were unhappy with their glasses. If he
    couldn't, he resolved, he'd change professions. That was in 1954.

    The eye is bound by six muscles. The muscles affect the shape of the
    eye, and the eye's shape affects the way we see.

    It is Sirota's opinion that muscles are most often constricted because
    of old, unresolved traumas as well as the tensions of everyday life.
    In his view -- and that of massage therapists everywhere -- "muscles
    have memory," and the developing eye is especially vulnerable to the
    stresses of trauma. Constricted muscles alter the shape of the eye,
    not only affecting our ability to "see" clearly, but also, he says,
    altering the way we perceive others, perceive ourselves in relation to
    others, and move through space.

    However idiosyncratic Sirota's views may appear, they fall broadly
    within the field known as vision therapy, which is widely practiced in
    the U.S. Just as there is a spectrum of treatment within medical
    science, from more traditional to more alternative perspectives, there
    is a similar range within optometry, and among vision therapists as
    well. Mainstream vision therapists largely work with children to help
    them with focusing or perception problems. Other vision therapists
    have a more "holistic" approach, working from the premise that
    behavioral changes affect eyesight. Harry Sirota would be off to one
    end of this group.

    As Sirota and other behavioral optometrists see it, traditional
    optometry treats the symptoms of eye problems -- poor eyesight --
    instead of examining the root of the problem: namely, why are the
    muscles around the eye constricted? Further, by using lenses that
    provide 20/20 sight (technically called "acuity"), they believe,
    patients' problems then become "locked in."

    While some see Sirota as an unheralded maverick on the cutting edge of
    optometric treatment, others dismiss him as an aging crank.

    "Harry is on the fringe," says Bob Williams, the executive director of
    the Optometric Extension Program, the oldest and largest organization
    of vision therapists. "His approach and philosophy are extremely
    unique," but "he seems to get results."

    Sirota pins much of patients' vision problems on early childhood
    stresses.

    Lack of proper nutrition and exercise, poor posture, improper
    breathing, lack of sleep, and the stressful nature of our lives also
    contribute to symptoms that may manifest as vision problems, but are
    in reality expressions of something much deeper. In this view,
    providing patients eyeglasses that offer 20/20 acuity is not a
    solution and instead becomes part of the problem.

    "We want to get the tension off the muscles" of the patients' eyes, he
    says. "It's a matter of clearing up the stuff that's troubled them all
    these years."

    The larger purpose is to allow the brain and eye to function smoothly
    together, and the prescribed lenses are meant to facilitate that freer-
    flowing movement. Further, that greater ease of movement, he believes,
    allows for change in other areas of a patient's life that feel stuck
    or blocked.

    "Perfect eyesight is not the same as perfect vision!" he'll remind
    you.

    Sirota sees only one patient a day now. Currently, most of his
    patients travel here from out of state. It's not cheap: an exam, which
    lasts about three hours, costs $175 an hour and does not include the
    cost of the new glasses.

    Some of the exam feels like a standard eye exam, such as looking at
    eye charts and being examined with the retinoscope (the instrument
    used to see the retina with a beam of light). However, Sirota examines
    the eye from different angles with the retinoscope "to see what is
    going on in the eye, to see what the patient has gone through and the
    possibility of change." In a standard exam, optometrists examine the
    retina directly in front of the patient only.

    Sirota says that if the eyes do not receive the correct amount of
    light the brain then receives faulty information, which then sends the
    wrong signals to the body. The results, he says, are patients who do
    not feel fully integrated in their bodies; for example, they may feel
    off balance, or report feeling "fragmented" or uncomfortable looking
    at others at a close distance, or have trouble following a moving
    target.

    Is there research to back up his ideas on the effects of light? "I
    don't think so," he says. His theories are based on his own
    observations built over the length of his career, he admits.

    This is the kind of stuff that makes standard optometrists crazy. "We
    value evidence-based optometry" and "theories that are based on
    research," says Dr. Arol Augsburger, president of the Illinois College
    of Optometry.

    "He's either a total crackpot or a total innovator who is so far ahead
    that no one knows what he is saying," says Williams.

    The exam takes an unexpected turn when it comes time to choose the
    correct lens strength. After using the retinoscope, Sirota asks the
    patient to try on a variety of lenses, asking which "feels" best. With
    their eyes closed.

    "It's easier for the patient to know how the lenses feel with their
    eyes closed," he says. "With the eyes open, the patients use their
    intellect." With the eyes closed, light enters the eye though the
    eyelids, he says, and patients can sense what is most comfortable.

    "I think that there would be no value to testing lenses with the eyes
    closed," Augsburger says. "This would provide no additional
    information which the optometrist could use to write a final
    prescription."

    The prescription Dr. Sirota provides is almost always much weaker than
    any previously prescribed standard lenses. This proves disconcerting,
    even infuriating, to his patients when they first try on their new
    glasses. "They all hate it at first," he says.

    `I was reborn," says Leo Weese, a general contractor from Denver, of
    the first day he wore a pair of Sirota-prescribed lenses. Weese, who
    had worn glasses since age 2, describes experiencing a vivid new
    clarity and depth perception and becoming instantly aware of the
    "beauty and life in everything." Now 58, "I'm integrated seamlessly
    into what's going on around me. I'm not putting out fires; I'm ahead
    of the game." And, he adds, "my golf game got incredible."

    Sirota sums up his work matter-of-factly, with more than a trace of
    the native New Yorker: "Listen, if you change your eyes, you change
    your life."












    A different vision
    Optometrist helps patients see the light about old traumas to improve
    eyesight

    Published June 13, 2006 - Chicago Tribune

    The optometrist was in his office, on the phone.

    On the other end was a woman whose husband was scheduled for glaucoma
    surgery the next day, and she was frantic, looking for a last-minute
    second opinion. The doctor, who had not treated the man before,
    listened carefully and then asked a series of questions:

    "Did he ever tell you what went on in his life when he was younger?"

    "What was his relationship with his father?"

    "Did he forgive his father?"

    For more than 50 years, Dr. Harry Sirota has been practicing optometry
    from the same unremarkable-looking storefront in Chicago's Uptown
    neighborhood. The unadorned window holds only a few plants and a sign
    that reads, "vision therapy." The plywood-paneled waiting room
    contains a handful of orange plastic chairs, piles of magazines and
    tottering stacks of mail.

    It is an unlikely destination, yet patients from around the country
    travel here for Sirota's own particular brand of optometry.

    Sirota does not see himself as a technician who, after conducting a
    series of tests, provides patients with corrective eyeglasses.
    Instead, he says, "I work with individuals with emotional problems
    that cause eye problems."

    "Emotions have the biggest effect on the eyes," he stresses. "When I
    look at someone's retina, what I see is how they chose to survive."

    Harry Sirota is an unlikely proponent of the unorthodox method he has
    developed. Born and raised in New York City, he came to Chicago to
    study at the Chicago College of Optometry (later the Illinois College
    of Optometry) for a career his father favored. There he learned the
    standard method of optometry, which meant fitting patients with lenses
    that provided 20/20 sight.

    It was while working at the school clinic that he says he started to
    notice the complaints of those being fitted for glasses. Many patients
    said they just did not feel comfortable with their new glasses. The
    instructors' response was invariably the same: "Tell them they'll get
    used to them!"

    After serving in the Army, Sirota settled here and soon rented the
    office on North Sheridan Road. He decided to try to discover why so
    many of his patients said they were unhappy with their glasses. If he
    couldn't, he resolved, he'd change professions. That was in 1954.

    The eye is bound by six muscles. The muscles affect the shape of the
    eye, and the eye's shape affects the way we see.

    It is Sirota's opinion that muscles are most often constricted because
    of old, unresolved traumas as well as the tensions of everyday life.
    In his view -- and that of massage therapists everywhere -- "muscles
    have memory," and the developing eye is especially vulnerable to the
    stresses of trauma. Constricted muscles alter the shape of the eye,
    not only affecting our ability to "see" clearly, but also, he says,
    altering the way we perceive others, perceive ourselves in relation to
    others, and move through space.

    However idiosyncratic Sirota's views may appear, they fall broadly
    within the field known as vision therapy, which is widely practiced in
    the U.S. Just as there is a spectrum of treatment within medical
    science, from more traditional to more alternative perspectives, there
    is a similar range within optometry, and among vision therapists as
    well. Mainstream vision therapists largely work with children to help
    them with focusing or perception problems. Other vision therapists
    have a more "holistic" approach, working from the premise that
    behavioral changes affect eyesight. Harry Sirota would be off to one
    end of this group.

    As Sirota and other behavioral optometrists see it, traditional
    optometry treats the symptoms of eye problems -- poor eyesight --
    instead of examining the root of the problem: namely, why are the
    muscles around the eye constricted? Further, by using lenses that
    provide 20/20 sight (technically called "acuity"), they believe,
    patients' problems then become "locked in."

    While some see Sirota as an unheralded maverick on the cutting edge of
    optometric treatment, others dismiss him as an aging crank.

    "Harry is on the fringe," says Bob Williams, the executive director of
    the Optometric Extension Program, the oldest and largest organization
    of vision therapists. "His approach and philosophy are extremely
    unique," but "he seems to get results."

    Sirota pins much of patients' vision problems on early childhood
    stresses.

    Lack of proper nutrition and exercise, poor posture, improper
    breathing, lack of sleep, and the stressful nature of our lives also
    contribute to symptoms that may manifest as vision problems, but are
    in reality expressions of something much deeper. In this view,
    providing patients eyeglasses that offer 20/20 acuity is not a
    solution and instead becomes part of the problem.

    "We want to get the tension off the muscles" of the patients' eyes, he
    says. "It's a matter of clearing up the stuff that's troubled them all
    these years."

    The larger purpose is to allow the brain and eye to function smoothly
    together, and the prescribed lenses are meant to facilitate that freer-
    flowing movement. Further, that greater ease of movement, he believes,
    allows for change in other areas of a patient's life that feel stuck
    or blocked.

    "Perfect eyesight is not the same as perfect vision!" he'll remind
    you.

    Sirota sees only one patient a day now. Currently, most of his
    patients travel here from out of state. It's not cheap: an exam, which
    lasts about three hours, costs $175 an hour and does not include the
    cost of the new glasses.

    Some of the exam feels like a standard eye exam, such as looking at
    eye charts and being examined with the retinoscope (the instrument
    used to see the retina with a beam of light). However, Sirota examines
    the eye from different angles with the retinoscope "to see what is
    going on in the eye, to see what the patient has gone through and the
    possibility of change." In a standard exam, optometrists examine the
    retina directly in front of the patient only.

    Sirota says that if the eyes do not receive the correct amount of
    light the brain then receives faulty information, which then sends the
    wrong signals to the body. The results, he says, are patients who do
    not feel fully integrated in their bodies; for example, they may feel
    off balance, or report feeling "fragmented" or uncomfortable looking
    at others at a close distance, or have trouble following a moving
    target.

    Is there research to back up his ideas on the effects of light? "I
    don't think so," he says. His theories are based on his own
    observations built over the length of his career, he admits.

    This is the kind of stuff that makes standard optometrists crazy. "We
    value evidence-based optometry" and "theories that are based on
    research," says Dr. Arol Augsburger, president of the Illinois College
    of Optometry.

    "He's either a total crackpot or a total innovator who is so far ahead
    that no one knows what he is saying," says Williams.

    The exam takes an unexpected turn when it comes time to choose the
    correct lens strength. After using the retinoscope, Sirota asks the
    patient to try on a variety of lenses, asking which "feels" best. With
    their eyes closed.

    "It's easier for the patient to know how the lenses feel with their
    eyes closed," he says. "With the eyes open, the patients use their
    intellect." With the eyes closed, light enters the eye though the
    eyelids, he says, and patients can sense what is most comfortable.

    "I think that there would be no value to testing lenses with the eyes
    closed," Augsburger says. "This would provide no additional
    information which the optometrist could use to write a final
    prescription."

    The prescription Dr. Sirota provides is almost always much weaker than
    any previously prescribed standard lenses. This proves disconcerting,
    even infuriating, to his patients when they first try on their new
    glasses. "They all hate it at first," he says.

    `I was reborn," says Leo Weese, a general contractor from Denver, of
    the first day he wore a pair of Sirota-prescribed lenses. Weese, who
    had worn glasses since age 2, describes experiencing a vivid new
    clarity and depth perception and becoming instantly aware of the
    "beauty and life in everything." Now 58, "I'm integrated seamlessly
    into what's going on around me. I'm not putting out fires; I'm ahead
    of the game." And, he adds, "my golf game got incredible."

    Sirota sums up his work matter-of-factly, with more than a trace of
    the native New Yorker: "Listen, if you change your eyes, you change
    your life."
     
    midwest_46, Jan 31, 2007
    #5
  6. midwest_46

    midwest_46 Guest

    A few days ago, I went to a movie theater. First, I tried to wear my
    -5 glasses. However, I felt some kind of headache. So, I then put on
    the -5.25 glasses. At first, the discomfort was alleviated. However, I
    soon felt a headache with the -5.25 glasses as well. So, I put on the
    -4.25, -4 glasses.

    I don't know how many times I switched between my three pairs of
    glasses at the theater. However, for the last half hour of the movie,
    I was able to wear the -5 glasses without discomfort.



    Right after the movie, I went to a Lenscrafters store. This was not
    the Lenscrafters where I had purchased the -5 and the -5.25 glasses.

    The people at the store told me the following: For any given lens, the
    prescription of that lens occurs only at the ocular center of the
    lens.
    For example, if I have a -5 lens, only the ocular center of the lens
    is at -5. As you travel away from the lens's ocular center, the
    prescription becomes different from -5. At the edges of the lens, you
    may get some distortion. So, the objective is to make sure that the
    pupil's center is at the ocular center of the lens.

    So, the people at the store took the -5 glasses and had some machine
    mark spots on the lenses to indicate the ocular centers of the lenses.
    I then put on the glasses so that we could see where my pupils were
    relative to the ocular centers. My left pupil seemed to be at the
    ocular center of the left lens. However, my right pupil seemed to be 1
    millimeter to the right of the ocular center of the right lens. The
    people at the store told me that the 1 mm distance between my pupil
    and the ocular center should not be enough to cause headaches.

    We tried the same process with the -5.25 glasses. My left pupil was
    somewhat above the left lens's ocular center, and my right pupil was 1
    mm to the right of the right lens's ocular center and a little above
    the center. I was told that the glasses could always be adjusted to
    make sure that my pupils were not above the ocular centers, and I was
    told again that my pupil's being 1 mm to the right of the center was
    not enough to cause a headache.

    The people at the store advised me to keep trying to wear the -5
    glasses. These people said that, if I still felt discomfort, I should
    go back to my eye doctor for a re-examination. These people said that,
    if a re-examination is done within 3 months of the original eye exam,
    the doctor will probably not charge anything for the re-exam.

    So, is a 1 mm difference between my pupil and the ocular center a
    significant difference? Also, should I go in for a re-examination?

    I should also point out that the frames of the -5 glasses are smaller
    than the frames of the -5.25 glasses. In the -5 glasses, each lens is
    50 mm long, and the bridge is 19 mm long (total length = 119 mm). In
    the -5.25 glasses, each lens is 53 mm long, and the bridge is 18 mm
    long (total length = 124 mm). The people at the store said that, the
    fact that the -5 glasses have shorter lenses and have a shorter total
    length, should not be the cause of any headaches. The store people
    said that the shorter lenses should cause less distortion. However, I
    believe that the shorter lenses and the shorter total length may be
    partially responsible for the headaches.
     
    midwest_46, Feb 5, 2007
    #6
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