Questions tagged [glasses]

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Ophthalmology: Less Ordinary Light-Protection Lenses [closed]

What are the less ordinary light filters used in glasses for people with light sensitivity to daylight but not so much to indirect artificial light? E.g.: are there glass lenses that mostly filter ...
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0answers
26 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 ...
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1answer
49 views

Using farsighted glasses to counter nearsightedness?

Edit: I might not have worded my question well enough. A shorter and more direct version would be: Can nearsightedness be just a result of eyes getting accustomed to working at very close distances ...
3
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1answer
48 views

Why are there different perscriptions for glasses and contacts? Help me see eye to eye on this

Why can't a prescription for glasses be used for contacts also? Isn't the eyesight still the same? At first, I cynically thought it was just another way for my optometrist to make money -- so he had ...
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0answers
13 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 ...
4
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1answer
53 views

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
26 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?
3
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0answers
36 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) ...
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0answers
28 views

Do computer lens have side effects? [duplicate]

I was introduced by a spectacles shop about a new technology called computer lens which block blue light that is harmful to eyes. He says it reduces eye-strain for workers who need to be face a ...
4
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1answer
2k views

Can very tight glasses restrict blood flow to the brain?

Can extended use of glasses that are very tight-pressing against the temples inhibit blood circulation towards the brain? I find that I get headaches if I wear tight glasses, and found a similar ...
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 ...
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1answer
45 views

Wearing under corrected diopter diving mask (hyperopia)

I have hyperoptia with roughly +5 diopters on both eyes and considering occasionally using diving mask for snorkeling in summer. The problem is, these masks usually come only up to +3.5 diopters and ...
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52 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 ...
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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 "...
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0answers
22 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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560 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
38 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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1answer
2k views

Help reading an eyeglass prescription: What does “PL” or “PC” mean?

I'm trying to purchase glasses online but I cannot figure out what the Spherical value is for the left eye (OS).
2
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1answer
2k views

Does eyesight significantly vary from day-to-day?

I think I need glasses and my visit to the optometrist has confirmed this. I've never worn glasses, and I'm new to all this, so I don't completely understand how things work. These past few weeks, I ...
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1answer
97 views

Increase vision clarity with eye exercices?

I haven't worn my glasses in a like a year and put them on today. I noticed that vision in one eye is slightly "off" as in, the glasses rated -2.5 power aren't correcting it fully. The difference isn'...
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0answers
15 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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1answer
252 views

How is the eye score interpreted?

I recently called my Optometrist to get my eye score so that I could buy my own glasses from the chemist. I was expecting to get a "+2" or "+1" or something like that but instead they gave me ...
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2answers
5k views

Do computer glasses actually work?

It's very likely that I will be spending most of my life in front of a computer monitor. This is necessary for my profession and the fact that improving technology requires us to look at screens more. ...
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5answers
29k views

Can tight glasses cause headaches?

I've been wearing glasses since I was about 7 years old (I am now 26). I wear glasses from the moment I wake up until I go to bed (except in the shower). I've had this problem for a very long time ...