How similar are these cylinder readings on eyeglass prescription?

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jkj2000@gmail.com - 21 Oct 2008 06:28 GMT

I can't quite make out a value from an optometrist's prescription.
The left eye cylinder reading either says "+0.7" or "+0.75". Is this
a big deal or nothing to especially worry about either way?

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otisbrown@embarqmail.com - 21 Oct 2008 14:11 GMT

Dear Friend,

Why not ask the person who wrote the "prescription"?

But, failing that, it is generally true that prescriptions are
written in 1/4 diopter "steps".

The value is probably +3/4 diopters.

Best,

On Oct 21, 1:28 am, jkj2...@gmail.com wrote:

> I can't quite make out a value from an optometrist's prescription.
> The left eye cylinder reading either says "+0.7" or "+0.75". Is this
> a big deal or nothing to especially worry about either way?

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Mike Ruskai - 21 Oct 2008 18:42 GMT

>I can't quite make out a value from an optometrist's prescription.
>The left eye cylinder reading either says "+0.7" or "+0.75". Is this
>a big deal or nothing to especially worry about either way?

It's +0.75. You won't find increments smaller than a quarter diopter (0.25)
on a prescription. Your eyes can vary by more than that throughout the day.

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- Mike

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