Nearsightedness (myopia)

myopia

October 8th is World Sight Day. I know two people who are born nearsighted, with the help of a good ophthalmologist and a pair of eyeglasses with concave lenses. They are 50% myopic today. They  said, they begin wearing eyeglasses at the tender age of two years old.

eyeglasses with concave lenses

eyeglasses with concave lenses

What is nearsightedness?

The ability to see distinctly only things that are close at hand. The medical name is myopia. The popular name is nearsightedness.

What cause nearsightedness?

In a near sighted person,  the eye is usually long from the front to the back. The image of an object some distance away is not focused on the retina at the back of the eye, as it should be, but at a point in front of it. Consequently, the object cannot be seen distinctly. By squinting, the nearsighted person obtain a clearer image. However, to solve his/her problem properly, he/she needs to wear a pair of eyeglasses with concave lenses that focus with image correctly on the retina.

Comments

Post a Comment

Popular posts from this blog

Birth Control Methods

Image
Conception can be controlled by mechanical or chemical means and by the rhythm method, and it can be prevented by surgical procedures performed either on the woman or on the man. Although some birth control methods can be used without any medical supervision, the most effective of the ones used by women require a medical examination. Birth Control Methods Available Without Medical Supervision Condoms: This is a thin, flexible sheath worn by the man over his penis in order to prevent the sperm from entering the woman’s vagina. The condom should be put on after an erection but before the penis  enters the vagina.  It is risky to wait until just before the male orgasm, because some sperm may leak out before ejaculation actually occurs. How to put on a condom The condom should be rolled on, leaving about half inch of loose space at the tip of the penis to collect the sperm. To facilitate entry into the vagina and guard against possible breakage of the condom, it should be lu...
Read more

Common headache causes

Image
We all suffered from some sort of headaches from time to time.  October is observed as breast cancer month. Do a monthly self-breast examination, read here for instruction  About one in four headaches is neither migraine nor caused by tension. A great variety of factors are responsible. For example, some women develop headaches a few days before menstruation. The headache appears as regularly as the electric bill each month. Other people find that if they drink too much alcohol they develop a headache, which is frequently an allergic response to the alcohol. Also, long hours of driving often produce tense muscles, that sometimes  cause you to have a headache. But headaches may develop for another reason when driving for long hours. Carbon monoxide may seep into the car, replacing some of the oxygen, and a prolonged minor deficiency of oxygen can induce a headache. Blocked sinuses can also be responsible for excruciatingly painful headaches. Usually thes...
Read more

Tension headache relief

Image
About 70% of all headaches are tension headaches, they are called tension headaches because they result from excess tension of the neck and shoulder muscles. This type of headache is often easy to diagnose, because the muscles at the back of the neck are exceptionally rigid. Anything that causes a person involuntarily to tighten the muscles of the neck can produce a headache. Long hours of uninterrupted driving can do it, as well as intense concentration-such as watching television or reading a book. Read about common headaches here Usually, of course, it is the emotional stress of our daily lives that causes us to become tense. Sometimes a gentle massage of the muscles helps to relieve the tension, warm compresses also help. Aspirin relieves some of the pain, but usually not all. Muscle- stretching exercises such as those practiced in yoga can often bring at least temporary relief, but yoga exercises must be done gently to prevent damaging a muscle.
Read more