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The answers provided are dangerously incorrect. Whether or not it is safe to mix multiple MPDS depends on the active ingredients, and they are rarely the exact same between brands and products. The danger is that you will dilute an active ingredient below the threshold required for antimicrobial activity. Say you filled a lens case halfway with MPDS 1, which uses Active Ingredient 1 in 0.0002% concentration. Since you ran out of MPDS 1, you decided to finish filling the case with a MPDS 2, having Active Ingredient 2 in 0.0002% concentration. Now, you have Active Ingredients 1 and 2 in 0.0001% concentrations, rather than the original 0.0002%. Both are at half the concentration the manufacturer designed them to be in. As a result, disinfection may be ineffective.
Computer vision syndrome is due to using computer for a long time, which lead to headaches, blurred vision, neck pain, dry eyes, dizziness, etc. Computer vision syndrome is a temporary eye disease, it has some methods to avoid it. First, adjust your monitor height and distance. Second, have a rest every one hour. Third, adjust the proper light. Fourth, wear special eyeglasses to protect. By doing this, you can get rid of it.
If you often use computer, you can prepare a pair o computer glasses no matter you have perfect vision or poor vision. Now, computer glasses are made of anti-reflective lenses that can protect the eyes from computer reflective lights. If you have perfect vision, you can choose non prescription computer glasses. If you have poor vision, you can choose prescription computer glasses for both eye protection and vision aids.
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Actually all glasses are without prescription initially. The original plastic lenses on the glasses displayed at the optical store can't be used for wearing. Even if you need plano glasses the processor will install plano lenses in the frame to replace the initial plastic lenses. For this reason, you can get non prescription glasses at every store which sells designer glasses.
Yeah, different face shapes needs different style frames. Longer face should wear cat eyeglasses to shorten the forehead and the lower jaw. Wide face is suitable for round black eyeglasses. And you also check and determine your skin on face. Sometimes you select a proper pair of eyeglasses but wrong color, you still fail to enhance your outlook. Plus, hair style is also very important.
That depends on where you go to have and what type of eye exam you wnat to get. I've found that an eye exam in Chicago would cost at least $220. The most expensive one would cost you $1,600. You can try Marketplace Vision which is located at 1306 S Halsted St Chicago, IL 60607 and you can see whether it is near to you. I've found the reviews about this store are all great, so I think it is a good place to have an eye exam. But I am not sure how much would the eye exam cost there. You can go there to get more information by yourself. Try this: https://www.yelp.com/biz/marketplace-vision-chicago#query:eye%20exam.
You will see better if you get the lenses that the doctor prescribed. If for some reason a lens with cylinder isn't available, -3.75 sphere is the closest, not -3.50.
Of course the first pair of glasses will weak with the time passing. Some people can have good eyesight but some can't because there are many factors that can affect our eyesight. If we often play computer games, we may have bad eyesight few months later. If we don't pay attention to the eye hygiene in our daily lives, we may get an eye infection and affect our vision too. But vision problems caused by infections will go away on its own after we treat with the infection. In all, our eyesight will drop when we get older, so the first pair of glasses will become weak and useless.
Yes, the astigmatism axis is very important to make prescription eyeglasses if you have astigmatism. If you provide incorrect astigmatism axis, you may get blurred vision or headaches even if the eyeglasses are made in exactly the right SPH, CYL and PD etc. So, You shall be careful.
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