Questions tagged [glasses]

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15 questions with no upvoted or accepted answers
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Health risk of lead crystal?

In the Wikipedia article on lead crystal it says that crystal glasses have become "rare" due to the "health risks" of lead. This seems kind of crazy to me. Isn't the lead oxide in the glass bound ...
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0answers
41 views

Are cheap sunglasses dangerous?

Does having any plastic between your eyes and the environment automatically provide UVA and UVB protection? Or do the lenses actually have to be coated (or be comprised of a special type of plastic) ...
2
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0answers
35 views

Does wearing UV blocking glasses worsen myopia in children?

I have found this article which claims (for chicken) that blocking outdoors UV light made myopia worse. Some kids require glasses from a young age, e.g. 6 years old. Most of these glasses do have UV ...
2
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0answers
81 views

Test UV protection on sunglasses

I bought sunglasses in China that claims to have UV400 protection. I'd like to test this as my eyes' health is on the line :) Is there any way to check the maximum UV amount these glasses can protect ...
1
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0answers
97 views

When a person who is nearsighted doesn't wear corrective glasses, what happens?

Someone wrongly tagged as duplicate my previous question. The question is: When a person who is nearsighted (eyeglass needs minus sign) doesn't wear corrective glasses, does it make the situation ...
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0answers
16 views

Eyeglass prescription

Question edited as per advice. When prescribing eyeglasses, is there an aspect of balance between magnification and astigmatism correction? should the magnification strength be reduced when increasing ...
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0answers
33 views

Is it normal for it to take more than 3 weeks to get used to astigmatism correcting glasses?

Is it common or realistic in the optometry industry to suggest to someone that it may take 6 weeks to adjust to new glasses?
1
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0answers
58 views

Cannot read from 20 metres away - even with glasses

I have had bad eyesight from birth, and i mean bad. My lenses on my glasses are as thick as anything, without them everything is blurry unless it is a couple of inches away from my face. Anyway, upon ...
1
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0answers
36 views

Can a small monitor + powerful reading glasses be a substitute for a large monitor with same resolution?

Reading or focusing up close puts strain on the eyes and I believe can be bad in the long run. With that in mind, would keeping my monitor at a distance (3-4 feet) and using the right set of "...
1
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0answers
23 views

What is my eyesight

According to my glasses prescription, both of my eyes are (or need) -1.00. I know I'm nearsighted, and it's a low number so it's not too bad. I'm trying to find what this would be as far as 20 out of ...
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0answers
672 views

What is the physical meaning of the following two ways of measuring dioptries wrt cylinders?

I was using glasses with the following parameters: left eye: -2.50Dsph -0.75DCyl right eye: -2.50Dsph -0.75DCyl Recently, the optometrist prescribed to me glasses with the following parameters: ...
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0answers
40 views

Child with -22 power, is it equal to blindness?

Doctor have advised -22 power glasses for my 3-year old daughter. Does it equal to blindness? Will she behave like a normal child - play, fight and ask for different things (as children do), identify ...
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0answers
16 views

How important is having an anti-reflection layer on a glass lens?

There are many factors that play a role when a person chooses their next pair of glasses. For example, I would think that the exact material of the lens would be of crucial importance. Yet, it looks ...
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15 views

Slanted view with one eye having astigmatism corrected

With the right eye having astigmatism corrected (Cyl increased from -0.5 to -1.25), the computer monitor looks like a trapezoid with the left edge shorter than the right edge. If the patient is ...
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0answers
73 views

Does the use of eye glasses prevent eye disease?

I'm turning 40 and went for my first eye test recently. They said I have nearsightedness. I work on a computer all day. They gave me three quotes for eye glasses : Option 1: (Cheapest price) 1.1 ...