1. number of glasses?( about eye weakness)

Hi
If someone is wearing glasses and you want to ask how weak her eyesight is, what question should we ask? Can we just ask 'how weak your eyes are?'. If it's appropriate then what can be the answer? I don't know if I could explain myself well or not. Each person's eye weakness is different from the others and that's a number that distinguish this difference. I'm looking for the question and the answer about it.

Thanks a lot.

2. Re: number of glasses?( about eye weakness)

It's minus 1.75.

3. Re: number of glasses?( about eye weakness)

hi,
Please note I'm not a teacher nor a native speaker;

The technical term is dioptre. It refers to the power/strength of the lens/es in glasses.
so the question would be something like :
I wear glasses myself but even if you asked me what is the strength of my glasses I wouldn't be able to answer it.
The only thing that I remember is that for shortsightedness(BrE)/ nearsightness(AmE) the number is negative.
and it's positive for longshightness (BrE)/farsightness(AmE).

cheers;

4. Re: number of glasses?( about eye weakness)

Visual acuity - Wikipedia, the free encyclopedia

In the US, we would ask what their vision was and expect an answer of 20/x, where 20/20 is "normal vision."

5. Re: number of glasses?( about eye weakness)

I can only imagine an optician being curious enough to ask a question like that in casual conversation rather than something like 'Do you wear glasses all the time?' 'Do you just need them for reading?' 'Are they useful for night-driving?'

Rover
(not an optometrist)

6. Re: number of glasses?( about eye weakness)

Originally Posted by SoothingDave
Visual acuity - Wikipedia, the free encyclopedia

In the US, we would ask what their vision was and expect an answer of 20/x, where 20/20 is "normal vision."
Does it mean that we can say "What's your vision" in American English?

Thanks.

7. Re: number of glasses?( about eye weakness)

Originally Posted by Winwin2011
Does it mean that we can say "What's your vision" in American English?

Thanks.
You could. But like Rover said, most people are not going to ask about such detail and I imagine most people who wear glasses probably don't know the numbers. They know if they are nearsighted or farsighted.

8. Re: number of glasses?( about eye weakness)

Originally Posted by SoothingDave
You could. But like Rover said, most people are not going to ask about such detail and I imagine most people who wear glasses probably don't know the numbers. They know if they are nearsighted or farsighted.
Thanks SoothingDave.

Are short-sighted and nearsighted interchangeable? I suppose American use "nearsighted" whereas British use "short-sighted" Am I correct?

9. Re: number of glasses?( about eye weakness)

Originally Posted by Winwin2011
Thanks SoothingDave.

Are short-sighted and nearsighted interchangeable? I suppose American use "nearsighted" whereas British use "short-sighted" Am I correct?
That is correct. We only use "short-sighted" metaphorically. Like when someone doesn't plan ahead or foresee certain problems, we can call them "short-sighted."

10. Re: number of glasses?( about eye weakness)

Myopia is "short/near-sighted", 'Longsightedness' is hypermetropia.
Many people understand 'myopic', but not the other, since 'myopic' is occasionally used metaphorically.

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