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The cornea is the clear window on the front of the eye. It bends incoming light rather dramatically to focus an image on the retina at the back of the eye enabling us to see. The cornea is constructed of overlapping layers of tight packed and orderly arranged collagen fibrils. Finally, there is an ionic pumping mechanism that maintains the delicate balance of fluid content that yields clear corneal tissue.
Post Graft
Corneas that have been damaged by injury or disease can lose their transparency resulting in virtual blindness. Relief can be provided by transplanting a donor cornea in a procedure known as a penetrating keratoplasty. There are a variety of different techniques, but they all result in a junction between the patient’s cornea and the grafted portion of the donor cornea. This procedure can enhance vision, reduce pain and improve the appearance of the affected eye.
Vision continues to improve for up to twelve months following the transplantation. While glasses can offer some vision correction, the irregularity of the cornea generally requires the use of a rigid gas permeable contact lens. The rigid lens provides a new smooth front surface to the cornea dramatically improving vision.
The junction between the existing corneal tissue and the graft must be monitored closely to detect signs of rejection of the transplant and to assure that the contact lens is not interfering with the healing process or the integrity of the post procedural corneal health. Fitting of these lens requires the expertise of an experienced professional.
This complex fitting requires the extensive experience that you will find at Parrelli Optical®
