36 street between market and chestnut in Philadelphia, PA [ About 69 Results ]

Whats the difference between Hard and soft Contacts?

For my experience , soft contacts are made of plastic-like material and are much more comfortable to wear and they are the best choice for most people . Hard lenses are uncomfortable and can fall out easily.But there are also some advantages over the soft lenses . They have better oxygen permeability than the soft ones and much easier to care .They can be used as long as 3 years if cared properly .Also they do a better job in vision correction than soft ones . For first time wearer ,it is better to choose the soft contacts as they are easy to get used to .

What is the difference between goggles and sunglasses?

Sun glasses are a visual aid, variously termed spectacles or glasses, which feature lenses that are coloured, polarized or darkened to prevent strong light from reaching the eyes, where as, Goggles or safety glasses are forms of protective eyewear that usually enclose or protect the eye area in order to prevent particulates, water or chemicals from striking the eyes. They are used in chemistry laboratories and in woodworking. They are often used in snow sports as well, and in swimming. Goggles are often worn when using power tools such as drills or chainsaws to prevent flying particles from damaging the eyes. Many types of goggles are available as prescription goggles for those with vision problems.

What is the difference between regular and astigmatism contacts?

Normal contacts have only one power, either for far or near. While astigmatism contacts have two powers in the lens, one is for astigmatism, the other is for far or near.

the True risk of sunglasses sold in the street

It is fake sunglasses sold in the street that hurts you.?since I saw a documentary on Discovery where they tested glasses and glasses street brands ..?and like the street and protecting brand the same was the only diffrent lenses look brand ...?but kept t

What are the differences between clip-on sunglasses and prescription sunglasses?

The prescription sunglasses look almost the same with the common sunglasses but the prescription can be added on the sunglasses lenses. It is commonly used outdoors to prevent the UV rays and strong rays from hurting your eyes. So people usually have a back-up eyeglasses when they are indoors. But the Clip-on sunglasses have two parts, the clip-on sunshades and a pair of prescription glasses.They can be used both indoors and outdoors. When you go outdoors,you can turn down the clip ons to protect your eyes from the sunlight and UV ray; when you come back indoors, you can turn up the clip ons and see objects through the prescription eyeglasses lens. Tha't the difference,you can decide which one to choose by yourslef.

How can you tell what's difference between real and fake eyeglasses?

Look through the lenses. Fake eyeglass has no prescription, while real eyeglass has prescription. If you have bad vision,then you put fake eyeglass on and you still can't see clearly.If you have perfect sight and put real eyeglass on , then your sight won't get so perfect and you will find everything is blurry.

What is the difference between transition and anti-glare lenses?

Photochromic lenses such as those made by Transitions Optical are clear (or nearly clear) indoors and darken automatically in response to sunlight outdoors. They also protect your eyes from 100 percent of the sun's harmful ultraviolet radiation. Anti-reflective coating (also called AR coating or anti-glare coating) improves both your vision through your lenses and the appearance of your eyeglasses. Both benefits are due to AR coating's ability to eliminate reflections of light from the front and back surface of eyeglass lenses. AR coating is especially beneficial when used on high-index lenses, which reflect more light than regular plastic lenses. Generally, the higher the index of refraction of the lens material, the more light that will be reflected from the surface of the lenses. It depends on your own choice and usage of your glasses. If you new glasses are usually used for computer use and night driving, you'd better choose anti-glare coatings. If you want to change the color of lenses on your glasses when you go outdoors and come indoors, you can choose photochromic. If you have both of the usage, you can choose both lenses to meet your demands. Source:http://www.allaboutvision.com/lenses/anti-reflective.htm http://www.allaboutvision.com/lenses/photochromic.htm

Has anyone used the Gunnar computer glasses for computer eye fatigue?

I've never tried Gunnar before, but have a look at their website but there is not anything making me feel interested . I don’t know what you mean by "that " . Computer glasses not only have magic function of vision correction but more importantly, they are unique and superior in reducing the computer radiation while we are working at the computer

Prescription Eyeglasses VERSES Store Bought Reading Glasses?

The glasses with number "+" are used for farsightedness who have problems seeing things close ,while the number "-" means nearsightedness . The reading glasses you can bought over-the-counter are usually come with "+", and I don't think they can come with a "-" .So for your case , you only need prescription glasses . You may need reading glasses when you age 40s .

What is the difference between farsightedness and presbyopia?

Presbyopia is common among people around 40 .As we age ,our eyes will have difficulty in automatically changing focus from seeing at one distance to seeing at another.So if you have to hold your book farther away in order to see clearly , this is an early sign of presbyopia. Although both farsightedness and presbyopia can't see things at close , the reason resulted in them is quite different . Presbyopia is caused by an age-related process while farsightedness is caused by the changing of the eyeball's shape and it is a refractive error of the eye where light from a distant object focuses posterior to the retina. Hope these will not confuse you .

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