Nov 15th 2021
Posted by Accuspire
All We Need To Know About Scleral Contact Lenses
Scleral contact lenses are bigger when compared to normal contact lenses. They are also expensive than normal lenses. Are they really worth it?
Sclera is nothing but the white part of the eye. It is a spherical layer which is rubbery but strong and makes majority if the eyeball surface. The cornea is another part which is clear, small, front portion of the eye where the iris is located. The iris is the colored part of the eye. Usually contact lens sits on the cornea. It is responsible to alter the corneal shape to provide a clear vision. When a person is suffering from dry eyes, the cornea becomes hypersensitive and when slightly touched, it experiences pain.
The cornea becomes thin and protrudes outwards in keratoconus. The normal type or soft lenses which usually sit on the cornea, do not provide good vision. Hard lenses provide good vision in this case but it feels uncomfortable for the sensitive cornea. The cornea gets a different shape after a corneal transplant and it becomes so irregular and impossible to wear any kind of contact lenses.
Sclera lenses are larger in size than cornea and do not touch the sensitive part. They also provide good vision and are comfortable. However there are some drawbacks too because they are very expensive and are reserved for critical corneal diseases such as dry eye syndrome and keratoconus. First, all types of cheaper alternatives are tried and if a person is still struggling, sclera contact lenses are provided.
The sclera is mapped at first using a special scanner. Then a matching contact lens is designed. Steps are also made to circulate the tears beneath the lens, thus creating a moisture chamber around the eyes. They are easy to place and remove and are stable in the eyes.
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