Myopia is generally referred to as short-sightedness. It signifies that the eye is incapable on focusing on faraway objects, resulting in the objects becoming hazy. Most types of myopia are regarded as a departure from natural vision, instead of a medical condition.
Vision can normally be rectified by means of glasses or contact lenses, or, in certain instances, with the help of eye surgery.
Light that enters the eye is focused onto the retina – a region on the wall located at the back of the eyeball. The cornea (a clear dome which makes up the external layer of the pupil) focuses seventy per cent of light that enters the eye.
The remainder is focused by the lens, which is located at the back of the cornea. If the light is focused correctly on the retina, we observe an image that is clear. The image becomes blurry when the light is focused in front of the retina.
In the case of myopia, the cornea happens to be extremely curved or the eyeball is exceedingly long. This implies that images are focused ahead of the retina rather than exactly on it.
Those Likely To Be Affected
- Myopia in the majority of cases generally occurs in childhood or early teens (between 8 and 14).
- The danger of developing myopia is enhanced in the event of a family history.
- It has been suggested that there could also be a connection between myopia and extended periods of close-up work, for instance reading or sitting near the television, even though there is not enough scientific proof to back the theory.
Myopia can be linked to particular kinds of cataracts, in which the lens happens to be cloudy. It can also be triggered by a condition known as keratoconus, in which the cornea becomes thin and more curved.
Short-sightedness which is temporary in nature and known as pseudomyopia can be brought about by several ailments or specific drugs. For instance, myopia may be the initial indication of type-2 (non insulin-dependent) diabetes. Indications of pseudomyopia can be effectively tackled if the underlying factor is dealt with.
SymptomsÂ of Myopia
- Objects located far away appear hazy to persons suffering from myopia; while objects that are located nearby can be witnessed more distinctly.
- Other indications are headache and weary eyes.
Myopia develops as the eyeball expands; hence it commences in childhood and may deteriorate during the teens. It generally ceases to get worse in adults.
Children who are below eight years old may not be aware that they have hazy eyesight.
Long-sightedness (hyperopia) is a phenomenon that pertains to natural ageing. This may offset the effects of myopia that is of the minor type. This is the reason why people with myopia discover that they can perform close work without glasses as they become mature. This is occasionally called “second sight”.