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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.
Wiki User
∙ 12y ago
Wiki User
∙ 11y agoBecause they are probably...
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What is the difference between long and short sight?
I think that eyes are fat and round and they bounce on the ground
Is it possible for evil people to wear glasses?
all people are the same evil people can ovisly wear glasses
What percent of people wear glasses in Canada?
About 96 millions people wear glasses in the whole world About 1.6 percent!!!
Why do people who were glasses have circles under the eyes?
People wear glasses because they are either longsighted or shortsighted. People who wear glasses may have circles under the eyes because it is the imprint of the glasses.
Dose Justin Bieber like people that wear glasses?
does Justin bieber like people that wear glasses no he dosent
Some that starts with a g to wear?
People wear glasses. People wear gloves. People wear golf shoes.
What percentage of Americans wear contact lesnses or glasses?
All the nerds, geeks and ugly people where glasses. With a few exceptions about 20% of the people who wear glasses are not ugly or disgusting
Does Katie Couric wear contacts for distance as well as reading glasses?
probably
If there are 200 people in a room and 80 wear glasses what fraction of the students wear glasses?
Two fifths...(assuming all the people are students)
How many people wear glasses in Canada?
About 60 percent of the population of Canada wears glasses at some point in their life. Some of these people only wear glasses at night or when reading.
Did people wear glasses in the 1700s?
yes
What do you call people who wear glasses?
The only formal adjective is the archaic "bespectacled." Otherwise, they are only "people who wear glasses."
