Type of vision correction

The three factors that produce unclear vision are:

1. the light that enters your eyes cannot focus at the proper place.
2. the curvature of the cornea.
3. the length of eyeball.

There are a number of ways to help individuals who suffer from impaired vision or "poor eyesight" For example:

Spectacles
For centuries, mankind has known how to use spectacles to refocus the rays of light to their proper points. It is a safe and popular method of correcting ones vision, but there can be limitations, such as when playing sports, occupational hazards or restrictions and even self-consciousness that the eyeglass wearer may feel.

Contact Lenses
When Contact lenses were developed, people were given another method to correct their vision. One advantage that contact lenses offer over eye glasses is a wider field of vision, but the daily, required rituals of cleaning the lenses, inserting them into the eyes and taking them out and re-cleaning them again at night causes some people to shy away from converting to contacts. Additionally, if the lens are not taken proper care of and cleaned regularly, there is a risk of infection. For some people with high astigmatism, contact lenses simply do not work.

Refractive Surgery
Researchers have developed Radial Keratectomy and PRK (Photorefractive Keratectomy) and LASIK (Laser In-situ Keratomileusis). For LASIK, this is the great revolution in ophthalmology innovation.

Type of vision correction