i think its around 65% but I'm not for her-sure

Is an optician

he wore them sometimes. he really only needed them to read

Short sighted people are not helped by lenses or anything else. Except the consequences of their short sightedness.

I think you mean near sighted people.

The eye is a lens and focal point system. The focal length of the eye can be manipulated by flexing muscles in the eye socket to change the distance between the lens and the back of the eyeball. A near sighted, or even a far sighted, person has an eyeball that is too long or too short for the lens, and therefore the image produced by the eye's lens is focused either in front of or behind the back of the eye.

A lens, either in a pair of glasses or a contact lens, can assist the eye by effectively pre-focusing the image that enters the lens of the eye to a sharpness that can be accommodated by the focal length of the malformed eyeball, focusing the image sharply on the back of the eyeball.

- wjs1632 -

Well, the truth is it depends on whether ur short or long sighted

if your long sighted then it wont shrink if ur short sighted for some wierd reason it will

I'm saying this from experience my whole family is short sighted except for me

and all of there eyes became smaller except for mine

a lens works when light goes through it and refracts (bends) inside the lens. so the light basically refracts inside the lens.
A camera lens uses refraction to focus light on the film, or in a digital camera on the CCD or other light-sensitive array. When a ray of light passes from a less dense to a more dense medium (such as from air to glass) it slows down. If it strikes the glass surface at an angle, it is also bent a little, and this is called refraction. When it passes back into air, it speeds up again, and is again refracted if the surface is at an angle. This makes it possible to design a curved piece of glass that will focus a parallel beam of light (arriving perpendicular to the lens, that is along its axis) to a point. The ideal surfaces are parabolas (or you can use one flat surface and one parabola, this is a plano-convex lens). When you use a magnifying glass to focus the sun's rays and set paper on fire, that's the effect you are using. The interesting thing happens when the light rays are parallel to each other but not parallel to the axis through the centre of the lens. Just take it on trust for a moment, this same lens will also focus these, but to a point above, below or beside the focal point for rays along the axis, and all these points of focus of parallel rays will form a plane, called the focal plane of the lens. So, you put the film at this focal plane, and you've now used the lens to concentrate the light on the film, and form an image. That will only work for objects far enough away that the light rays are roughly parallel to each other. For closer objects, you need to move the film a little closer to the lens. That's what happens when you focus a camera (or autofocus does this for you). The bigger the lens, the more concentrated the light, but the more critical focussing becomes. So, camera lenses have a second control, the iris or f-stop, that changes the size of the lens by masking the outer bits of it. It's a compromise between getting lots of light and making the focus more forgiving. If you use a very small lens, lots of things will be in focus. That's called depth of field. Whew! Still there? Camera lenses are normally made of four or more bits of glass or plastic, because this ideal one-piece lens doesn't work for two reasons. Firstly, the amount of bend depends on the colour. This is called chromatic aberration. Secondly, in practice it's hard to make parabolic lenses, but far easier to make spherical ones, which are close to ideal in the middle but get fuzzier as the lens gets bigger. This is called spherical aberration. Both of these can be corrected by using compound lenses, that is lenses made of more than one element - but never perfectly. Next, we can look at zoom lenses, or retrofocus lenses (a way of designing lenses to make them more compact). But that's probably enough for now.

when there is a chance that something may come into contact with your eye

I'm an ophthalmologist, so this is right up my alley. It is not bad for your eyes if the lenses don't have power in them, so if this is the case, then go right ahead! Truthfully, it is not bad for your eyes even if the lenses do have power in them, but doing so can cause symptoms such as eye strain, headaches, and fatigue.

Glasses aren't for people that are blind. There's no cure for blindness. It's simply for people who have poor eyesight. And yes, people would go blind if they did not cure their vision problems.

Frames for eye glasses can be made from a number of materials or combinations of materials. Plastic frames are perhaps the most versatile material for frames. They are light, comfortable and come in a wide variety of styles and colors. Frames are also available in metal and wood.

Throughout the ages, people have used different tools similar to glasses to see. For example, Seneca the Younger used a globe of water, and Emperor Nero of Rome used an emerald. The first wearable gasses, however...well, no one knows who REALLY created them. They just have guesses. Here they are:

Someone in China

Some one in the Middle East

Someone in Italy

Salvino D Armate.

No one is sure, and I think there are other opinions, too. Hope this helps!

When a product becomes discontinued the manufacturer of that product stops making it. Once the manufacturer stops making the product it will not be available anywhere either online or in retail stores. An alternative is to search for eyeglass frames at Glassesetc which features designer frames at up to 50% off retail price.

Distances - as opposed to reading etc.

There are three main reasons people need glasses for distance vision.

Primarily Myopia (shortsightedness)is the cause for most people and this is because optically light converges not on the retina but falls short therefore a concave lens is required to placed in front of the eye in order to obtain the clear image.

Astigmatism is where vision is best described as skewed owing to the shape of the eyeball this condition affects both near and distance vision and can be very tiresome.

Finally hyperopia- (longsightedness) is NOT as many people believe "simply the opposite of myopia(shortsightedness) Hyperopia is opposite only in the respect that the rays of light are focused behind the eye and a convex lens facilitates this.

More often than not people with hyperopia have more difficulty with near objects, but depending on the amount of hyperopia and their age (if over 45 or so) they could well require the convex lenses to see at distance.

It depends on what kind of contacts and the amount given. Usually, for a "one month" pair, it'll be usually about six months per prescription, or six contacts per case.

Usually contact lens prescription is good for one year. After the year from when you had your eyes exam, the office or you yourself can make another exam to see if you can still see in your current prescription.

The ear hooks are called "arms" or "temples" and fit over the ears.

Gained from the following website

http://www.supergluecorp.com/removingsuperglue.html

Eyelid

In the event that eyelids are stuck together or bonded to the eyeball, wash thoroughly with warm water and apply a gauze patch. The eye will open without further action within 1-4 days. To our knowledge there has never been a documented case of adhesive in the eye causing permanent damage. Do not try to force eyes open.

Eyeball

The adhesive will attach itself to the eye protein and will disassociate from it over time, usually within several hours. Periods of weeping and double vision may be experienced until clearance is achieved. Use of a warmed 3% sodium bicarbonate solution to wash eyes repeatedly may assist in aiding more rapid removal of the adhesive.

WE SUGGEST THAT ALL INCIDENTS OF EYE EXPOSURE TO CYANOACRYLATE ADHESIVE (SUPER GLUE) BE DISCUSSED WITH A PHYSICIAN.

Essentially you'll clean the lens by rinsing it thoroughly with the appropriate contact lens solution. Check the related links area for a guide to cleaning your contact lenses which includes steps on how to clean the lenses, what solutions to use, and more.

Eyeglasses do not make you smart or smarter. You can look smarter but it does not affect how you do things in any way. However, if you believe wearing glasses will make you smart, then psychologically, it may help you perform little better.

Volcanic glass or obsidian maybe gave someone the idea. Or, maybe, the nodules of glass that can form when lighting goes to ground through sand. In any event, glass is made by heating sand until it melts.

Actually, the sand particles have to be separated first. If you just melted sand you would get a dark, non-transparent glass. You have to find the clear crystals in the sand to make glass. It is then melted and either blown or molded into the desiered shape. Glass was probably discovered after a volcanic eruption near a beach.

Glass was first created by the Phoenicians and the Egyptians. The Egyptians used it as a glaze for pottery. This occured around 2500 B.C.

It means you don't see as well as people with 20 20vision, I would think. --*Actually it means you see BETTER at a distance than someone with 20/20 (normal) vision. 20/10 vision means that you see at 20 feet away what most people with normal 20/20 vision need to be 10 feet away in order see clearly

Not necessarily, watching anything for a prolonged period of time can be bad for you, especialy monitors. If you're 6 or under, the 3D illusion can lead to poor eye development though, so the 3DS is strictly for ages 6+.

Medi-Cal covers some level of dental service for virtually every Medi-Cal recipient. The level depends on the category of aid the person is receiving. Most children are eligible for a pretty comprehensive range of services, including exams, x-rays, preventive services like fluoride applications and dental sealants, fillings, extractions and, in some cases even orthodontics.

Fewer services are available to most adults because of budget cuts implemented in July 2009. Most adults are limited to services for the relief of pain, trauma or infection, e.g., extractions, sedative fillings. Pregnant adults are eligible for some preventive services and some periodontal (gum) treatment, but not fillings. Most adults who reside in nursing facilities are eligible for the same full scope of services as most children.