Questions tagged [lenses]

Questions about safe use of lenses, good hygiene habits, safety and complications that can occur.

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Which part of lens is involved in refraction?

I'm reading about cataract and various morphologies related to it. Some of them are visually significant cataract some are not. I'm unable to understand why it is like that. For example punctate ...
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22 views

Is there a way to protect eyes from negative effects of computer and mobile screen? [duplicate]

People who work on computer and smartphone during most hours of the day are prone to impacts of the light of these screens. I have read about the negative effects of the light from screen. So I was ...
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43 views

Derivation of the relationship between snellen rows and diopters

The results of converting between rows of a snellen chart and diopters is indicated in the tables at these two links: How to Convert Diopters to 20/20 Vision and Conversion Table for Distance Vision ...
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1answer
136 views

The next generation of contact lenses

My eyes have the problem of keratoconus and the last 10 years I live using rigid gas contact lenses. The last years piggy-backs. But I am not so satisfied with the precision and accuracy. To be more ...
2
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1answer
48 views

Is it ok to not wash a contact lens?

My contact lens fell out onto a relatively clean surface. I picked it up and put it back into my eye without washing my hands or the contact. There were no visible particles on the contact and the ...
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0answers
24 views

The effect of Wearing Contact Lenses during Working hours

I always hated wearing my glasses. I find them cumbersome, reduce visibility since most of the time they're smudged, they tend to fall off with certain movements (like hugging your dog), etc... I ...
4
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1answer
170 views

How can I tell if a soft contact lens is inside out?

Soft contact lenses can be turned inside out. It then becomes difficult to know which is the right way around. This is especially a problem when I have put contact lenses in, then accidentally knocked ...
14
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1answer
273 views

How safe are contact lenses?

Are there any side effects to wearing contact lenses for a long time? Is there any way that wearing them can damage your eyes? I'm referring to long-term use that is within or close to the ...