Keratoconus is a progressive noninflammatory thinning of the cornea that is usually bilateral and involves the central two-thirds of the cornea resulting in a cone-shaped protrusion of the cornea. It induces myopia and irregular astigmatism and may decrease the quality of vision.
For those who obtain good vision with glasses and have keratoconus in non-progressive phase, toric implantable lenses can reduce the need for glasses and in many cases eliminate the need for optical aids.
Toric ICL (Implantable contact lens)
The Collamer ICL is an extra lens, similar to a contact lens. The difference is that the ICL is placed inside the eye, rather than on the surface of the eye. The ICL is specially shaped to correct Shortsightedness, Farsightedness, and Astigmatism. The Toric ICL also corrects mixed astigmatism often found in combination with short and farsightedness. The lens works in a similar way as glasses or contact lenses by changing the way light is focused on the retina.
As the ICL is tiny and soft, it can be folded up so small that it can be injected into the eye in seconds through a tiny self-sealing opening.
Once injected, the ICL unfolds into position in the liquid between the iris and natural lens.
The ICL is made of a unique bio-material called Collamer. Collamer is accepted by the eyes as not being a ‘foreign tissue’. This means that the body does not react or reject the ICL as a foreign body. Other special features of Collamer are its optical clarity and the flexibility and elasticity that allow it to be folded up and then to recover its correct shape in the liquid inside the eye.
ICLs are intended to remain in place without maintenance however patients are advised to be seen annually by their eye surgeon to ensure all remains well. If it becomes necessary, for any reason, ICLs can be easily removed by trained surgeons.
We were the first in Iran to use Toric ICL in treatment of keratoconus and our follow up has yielded promising results.
Kummelil MK, Hemamalini MS, Bhagali R, Sargod K, Nagappa S, Shetty R, et al. Toric implantable collamer lens for keratoconus. Indian journal of ophthalmology. 2013 Aug;61(8):456-60.