How Do Contact Lenses Enhance Vision?

How Do Contact Lenses Enhance Vision?

Understanding the eye

To grasp how contact lenses work, you first want to know a little concerning the eye. At its most basic, light reflects off an object and passes by means of the cornea, the transparent covering of the eye. Subsequent it travels to the pupil, the black part of the eye, after which by way of the lens, which focuses the rays on the retina at the back of the eye.

The retina is filled with things called rods and cones and these take the light and convert it to electrical impulses which are then despatched to the brain for kpop2 processing. When you get blurred vision, this is due to something called 'refractive errors' and is when the form of the eye stops the light reaching the retina directly and leads to distortion.

Fixing these errors

So to fix these errors, we use a tiny plastic lens that corrects them by making a film that makes contact with the eye (hence - contact lenses). They work in the same way as glasses to focus the light on the retina and allow the eye to work properly. There are a number of different types of errors that leads to different issues and require totally different prescriptions to correct.

Myopia or near-sightedness is the place object distant seem blurred while objects shut by seem clear. This occurred when the light getting into the eye isn't correctly focused and is caused by the form of the eye. This is without doubt one of the commonest conditions and there are various contact lenses that right it.

Hyperopia or farsightedness is the opposite, where objects shut by are blurred however those further away are clear. Once more, this is relatively frequent and there are many lenses to appropriate it.

Presbyopia is an age-associated situation just like hyperopia where items shut by change into blurry however comes from a special cause. While hyperopia comes from the form of the eye, presbyopia comes from the eye lens hardening with age. To appropriate the situation, multifocal lenses are often used as they can clear both the close to and the far blurriness.

Finally, astigmatism is a situation where the irregular shape of the cornea or the lens stops the eye from focusing the light on the retina. A special class of lens is used to right this situation, called a toric contact lens. Usually, an image of a ball can be used to visualise the completely different - a sphere lens is like a beach ball where a toric lens is more like a rugby ball.