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Quảng cáo

How Do Contact Lenses Improve Vision?

How Do Contact Lenses Improve Vision?

Understanding the eye

To grasp how contact lenses work, you first want to understand just a little concerning the eye. At its most simple, light displays off an object and passes by way of the cornea, the clear covering of the eye. Next it travels to the pupil, the black part of the eye, and then by way of the lens, which focuses the rays on the retina at the back of the eye.

The retina is full of things called rods and cones and these take the light and convert it to electrical impulses which are then sent to the brain for processing. If you get blurred vision, this is because of something called 'refractive errors' and is when the shape of the eye stops the light reaching the retina directly and leads to distortion.

Fixing these errors

So to fix those errors, we use a tiny plastic lens that corrects them by creating a film that makes contact with the eye (hence - contact lenses). They work in the same manner 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 totally different problems and require totally different prescriptions to correct.

Myopia or close to-sightedness is where object far-off appear blurred while objects shut by appear clear. This happened when the light coming into the eye isn't accurately targeted and is caused by the shape of the eye. This is without doubt one of the most typical conditions and there are numerous contact lenses that appropriate it.

Hyperopia or farsightedness is the opposite, the place gadgets close by are blurred however those additional away are clear. Again, this is relatively common and there are lots of lenses to appropriate it.

Presbyopia is an age-related condition just like hyperopia where objects shut by become blurry but comes from a different cause. While hyperopia comes from the shape of the eye, presbyopia comes from the eye lens hardening with age. To right the situation, multifocal lenses are often used as they'll clear both the near and the far blurriness.

Finally, astigmatism is a condition the place 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 appropriate this situation, called a toric contact lens. Typically, kpop2 an image of a ball can be utilized to visualise the totally different - a sphere lens is like a beach ball the place a toric lens is more like a rugby ball.