What are scleral contact lenses?
Scleral contact lenses are a type of contact lens with a large diameter. They are designed to fit over the white of the eye (the sclera) - not just the cornea. There is no physical contact with the cornea itself, as the lens “vaults” over the cornea while resting on the sclera. This tends to produce a more comfortable fit for patients and fewer cases of dry eyes.
Scleral lenses can come in a range of sizes depending on the complexity of the condition you have.
What are scleral contact lenses for?
Scleral contact lenses help to correct vision in patients who struggle to wear soft or gas-permeable contact lenses. They can be used by patients with a wide range of conditions including:
- Keratoconus
- Dry eyes
- Severe astigmatism
- Corneal scarring
- Corneal irregularities following refractive surgery
As well as being comfortable, scleral lenses encourage optimal corneal health by ensuring it stays wet and is protected from foreign objects. Scleral lenses are fixed in place and therefore do not rotate out of position. Ultimately, a patient with corneal problems may be able to delay corneal transplant surgery.
Are scleral lenses confortable?
Scleral lenses are generally considered comfortable once properly fitted. They don't touch the sensitive corneal surface, so many users find them more comfortable than traditional rigid gas permeable lenses. However, comfort can vary among individuals.
How are they fitted?
Scleral lenses are custom-fitted by your eye doctor. The fitting process involves measuring the eye, selecting the appropriate lens size, and ensuring a proper fit. Several visits may be required to fine-tune the fit.
What are the alternatives?
If you have astigmatism or keratoconus, you may benefit from regular or toric contact lenses, or eyeglasses. In severe case of corneal damage, a corneal transplant may be required.