What causes shortsightedness? Could it be prolong close work or just genetic factors? Please gives your view.?

Question

myopia

Answer 1

I think genetic factors are the strongest link. My optometrist (sp?) told me that close work and wearing my regular glasses to read won't really damage my eyes anymore than they already are. And so far he's been right. They haven't changed in almost 10 years since I got glasses and 5 years since I got contacts. But everybody in my family has some degree of nearsightedness, so it's probably 99% genetic. But other factors could come into play, like birth defects, injuries, infections, etc.

Answer 2

Both. It is too simple to say that food and exercise are purely environmental factors. Appetite is controlled by genetics, for example the hormone leptin. The leptin gene was studied using mutant mice, who were all obese. The presence of leptin decreases appetite and increases metabolism, meaning that energy is used faster. Prader-Willi syndrome is another purely genetic condition where appetite is completely unregulated - sufferers are literally capable of eating themselves to death if unsupervised. However, other reasons for overeating such as comfort eating may be considered environmental. Reasons for not exercising frequently enough may be largely environmental in this day and age but could also include inherited heart, lung, limb and joint problems. Other than genetic factors controlling appetite, there are also genetic factors controlling how food is used after it is eaten. For example, women are more likely to have fat stores than men and also store fat in different areas of the body. Some people may extract more energy from food than others by processing their food more efficiently versus passing it out as waste. And some people do just seem to have a faster metabolism, meaning that they use up the energy very quickly. It is an interesting question with no definitive answer, but I think there is a good case for both types of factors being relevant.

Answer 3

Prolonged close work does NOT cause nearsightedness. It is mostly genetics, and is caused by a misshapen eyeball. No amount of close work will cause your eyeball to become permanently misshapen. It can cause temporary eyestrain, but not myopia.

Answer 4

According to my Opthamologist, it's the shape of my eyeball. Instead of being perfectly round, so the picture is displayed on the back, and read by the optic nerves, it is elongated, and I get a fuzzy picture. Along come the glasses that change the focus of the picture, to place it exactly on the back of my eyeball, so I can clearly see what's in front of me. Does that help?

Answer 5

Are you talking about Short Sightedness or Near Sightedness ? Being short sight is a learned behavior , being near sighted is a physical defect that may be inherited.