Scleral lens is a good option if you have an uneven corneal shape or suffer from severe dry eye. Scleral lens is a large diameter contact lens that covers the cornea and rests on the sclera/conjunctiva, providing increased comfort. The flat, smooth surface helps to correct vision issues caused by eye disease such as keratoconus and other corneal irregularities. 

• Replacing glasses with thick lenses.
• Severe dry eyes
• Strong prescription and/or high astigmatism
• Having dry eyes from wearing soft contact lenses
• Vision cannot be corrected with glasses or soft contact lens 
• A slow-healing wound from corneal surgery or Lasik 
• Medical Diagnoses: Keratoconus (cone-shaped cornea), Endothelial cell disease, Dry eye disease (corneal hydration)
• People who enjoy water activities such as swimming or diving. As the lens is larger than the pupil and is hard. This makes the lens stick to the cornea better than other types of lenses.

Scleral lenses have a similar diameter to soft contact lenses, although they could be made slightly larger than a conventional soft contact lens. Scleral lenses are larger than ordinary gas permeable contact lenses, even though they are a form of gas permeable lens. The size ranges from 14.5 to 24 mm, while the average human cornea measures 11.8 mm in diameter. This will allow the lens to completely cover the cornea’s surface, improving the lens’ comfort.