Does this Prescription look right?

Hello,
I just got a prescription for some eyeglasses and contacts and am
trying to make sense of it. First let me give you the numbers:
For the Eyeglasses:
OD Sphere -1.75, no astigmatism
OS Sphere -4.25, Cylinder -050, Axis 015

For the Contact lenses:
OD Sphere -1.75
OS Sphere -4.50
B. Curve 87
Diam: 14.0

Now from the reading I've done I can figure out what some of these
numbers mean, but I need help with putting it all together.

It seems that because I have no astigmatism in my R eye, and because
the power is less than -4.75 (so no correction factor is needed for
glasses and contacts), the powers for the contacts and eyeglasses will
be the same. Is this right?

But for the left eye, I have read that at powers of -4.75 and above, a
correction factor starting at 0.25 needs to be added to the contact
lens Rx. But it seems my L eye power is listed as -4.25. However, the
astigmatism power is -0.50. Would I be correct in adding these two
values together, to get a value of -4.75 for the L eye, which the
optometrist then added 0.25 to arrive at the -4.50 value for the
contact lenses?

Thanks for helping this amateur optometry sleuth.

 

No. you add 1/2 the astigmatism power to the spherical power to obtain what
is called the "spherical equivalent" power. It adds up to -4.50 in this
case. -4.50 is right on the breakpoint where you might consider adjusting
the contact lens power down by a quarter (to -4.25). For me it depends on
the patients age, and whether I get the "feel" that they are slightly higher
or slightly lower than -4.50. I pick up that "feel" from how they respond
during the refraction. Your doctor just left the contact lens power
at -4.50 which should be fine.

RM

 

For the left softlens S-4.00 will do.
When you are young of age you might consider S-4.25 which gives you most of
the time a bit more vision in the dark or at twilight.
The S-4.50 is to strong in power.