How the eye works
Light enters the eye through the cornea, a transparent window-like structure which provides around two thirds of the eye’s focusing power. Finely adjusting the cornea with laser surgery can thus help correct some focusing problems.
Astigmatism is the term used when the cornea is not regularly shaped. A normal cornea is round and spherical (like a football) so that regardless of which direction light comes from it is focused to the same spot. In a cornea with astigmatism, the curvature is different in two planes so the cornea is more rugby ball shaped. This means that light is focused at different points, causing the potential for vision to be blurred or distorted. Astigmatism can be corrected with refractive surgery.
The lens sits behind the cornea and coloured iris and is responsible for the remaining fine focusing of the eye, giving us both distance and near vision through a process known as accommodation. In later life accommodation reduces (a process known as presbyopia), and you may find that you need to wear spectacles to help with reading. The lens can also become irreversibly cloudy (known as a cataract).
Finally light is focused onto the retina – the photosensitive lining at the back of the eye that creates chemical messages, travelling through several sets of nerves to the brain. The brain then interprets these messages into ‘sight’.
Here at Lakeland Vision, Mr Gerard Ainsworth offers management and surgical correction for a number of eye conditions.
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