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contact lenses are medical appliances and great care should be maintained in their use. There is always a risk of eye infection, if your contact lenses are not cleaned properly, or if your hands are not clean. contact lenses must always be cleaned and disinfected before they are re-inserted into the eye. There can be a (small) risk of developing corneal ulcers or other serious conditions if you do not follow your optometrist's advice on handling and wearing the contact lenses. Particularly when wearing them beyond the recommended times. However, by following good practice most patients enjoy many years of successful wear of disposable contact lenses. Attend your optometrist regularly. For extended wear contact lenses, that is, if you wear them overnight, your eyes should be checked by your eye care professional at least once every three months. Other disposable contact lens wearers, ideally, should have their eyes checked every six months, but certainly at least once a year. In fact we can only supply contact lenses if we see a signed contact lens prescription from your optometrist dated within the last twelve months - this is a legal requirement in the UK. A spectacle prescription is not sufficient.

The ball of the eye consists of three coats. There is a hard white outer coat called the sclera that we can see as the white of the eye. Inside this there is a coat rich in blood vessels called the choroid which supplies the nutrition for the eye, and, inside this is the retina, that is the part of the eye that responds to light, like the film in a camera. The retina sends its messages to the brain through the optic nerve allowing us to see. At the front of the eye the outer coat becomes the cornea, which is very transparent and the most sensitive part of the body. You just can't bear it to be touched. In the same region the choroid becomes the iris, the coloured part of the eye that consists of the muscles that control the size of the pupil, which is the hole through which the light has to pass to be focussed by the lens in onto the retina. Covering the cornea there is a very thin membrane that extends over the front of the eyeball and the inside of the lids called the conjunctiva. If this gets infected its called conjunctivitis, and the eye gets red and sore. This can be caused by dirty lenses.