What does my glasses prescription mean ?

Discussion in 'Glasses' started by mangled_us, Aug 8, 2006.

  1. mangled_us

    mangled_us Guest

    Hi,

    I've just had my eyes tested for the first time in years and I've been
    told I need reading glasses. I'm curious to know what the prescription
    means, and it states aas follows :

    R : SPH +0.75, ADD +0.50
    L : SPH +0.75, ADD +0.50

    There are other fields for CYL, Axis Inter-ADD and BVD but these are
    blank, there also seems to be a whole section with LPrism and RPrism,
    H-Dist, V-Dist H-Near and V-Near which has no entries at all.

    Can anyone tell me what this all means or point me to a website where
    all this is explained ? (I particularly want to know what SPH and ADD
    mean).

    Thanks,

    David
     
    mangled_us, Aug 8, 2006
    #1
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  2. mangled_us

    acemanvx Guest


    It means as you get older, presbyopia has become apparent. Youve been
    prescribed bifocals so you can see things up close. You could just buy
    $8 reading glasses if you dont need or want bifocals. Much easier with
    regular readers for the computer
     
    acemanvx, Aug 8, 2006
    #2
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  3. mangled_us

    drfrank21 Guest

    You are mildly hyperopic/farsighted (+.75 sph) with a very
    mild amount of presbyopia (inability to accommodatefocus
    at near as we get into the 40's) though I suspect the add +.50 is
    incorrect (probably more likely it is written +1.50 add).
    Regardless, your prescription is pretty mild.

    frank
     
    drfrank21, Aug 9, 2006
    #3
  4. mangled_us

    Charles Guest

    I'll take a shot, but I'm not a doctor. SPH means "spherical"
    correction, also known as "power". Plus numbers mean farsighted. Plus
    lenses make close things optically farther, thus they are also used for
    reading glasses. The ADD part is the bifocal or progressive part of
    the prescription - it's the amount of additional plus power added at
    the bottom of the lens to be used for reading or close work.

    I think +0.75 would be considered mild farsightedness. The ADD part if
    generally for people with presbyopia, where they can't accomodate as
    much (your eyes accomodate from distance to close; with perfect eyes or
    eyes corrected properly, the eyes are relaxed at distance. They "work"
    for close up, and this ability degrades with age).

    Negative SPH would indicate nearsightedness, the inability to focus far
    away. CYL is there to correct astigmatism, where the power required is
    different in different orientations. The AXIS indicates the
    orientation.

    Hope this helps. Like I said, I'm no doctor, so one might chime in if
    I made a mistake.

    --
     
    Charles, Aug 9, 2006
    #4
  5. mangled_us

    Mark A Guest

    do a Google search using these search terms (all at once):
    sphere cylinder axis
     
    Mark A, Aug 9, 2006
    #5
  6. mangled_us

    mangled_us Guest

    Doh !

    It should have been :

    R : SPH +0.75, ADD +0.50
    L : SPH +1.25, ADD +0.50

    ie the left SPH is slightly more than the right.

    ....snip comprehensive reply...
    Thanks for the reply, the optician did say I had slight farsightedness
    and also Presbyopia. How can I tell from those numbers what strength
    of reading glasses I need ? Does it make any difference that the value
    of SPH is differend fro the right and left eyes ?

    Thanks again,

    David
     
    mangled_us, Aug 9, 2006
    #6
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