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Corneal cross-linking (CXL) treatment, performed in a sterile operating room setting, fundamentally involves two stages. The eye undergoing the procedure is first anesthetized with topical drops. Subsequently, the eye and surrounding area are aseptically cleaned and prepared. A blepharostat is then placed to keep the eye open throughout the procedure.
In the first stage, the central corneal epithelium is meticulously removed over an area of 8.5-9 mm in diameter. Following epithelial removal, corneal thickness is precisely measured. Subsequently, riboflavin solution is applied topically to the eye every two minutes for a total duration of 20 minutes. At the conclusion of this phase, corneal thickness is re-measured. This measurement is critical, as the thinnest point of the cornea must exceed 400 microns to proceed with UV-A irradiation.
If the corneal thickness meets this criterion, the second stage, UV-A light therapy, is initiated. The duration of UV-A irradiation varies, typically ranging from 3 to 30 minutes. Under the standard protocol, UV-A irradiation lasts 30 minutes, a duration often preferred for patients under 18 years of age, who are at higher risk of disease progression. For adult patients, accelerated protocols (with irradiation times of 9-10 minutes) are increasingly favored today. During the second stage, riboflavin solution continues to be applied to the cornea every two minutes while UV-A irradiation is administered.
Upon completion of the procedure, the cornea is thoroughly irrigated, thickness is re-measured, and a bandage contact lens is placed on the eye. This contact lens remains in place until epithelial healing is complete, typically by the third or fourth day, after which it is removed.
How is the corneal cross-linking treatment method applied?
In the first stage, the central corneal epithelium is meticulously removed over an area of 8.5-9 mm in diameter. Following epithelial removal, corneal thickness is precisely measured. Subsequently, riboflavin solution is applied topically to the eye every two minutes for a total duration of 20 minutes. At the conclusion of this phase, corneal thickness is re-measured. This measurement is critical, as the thinnest point of the cornea must exceed 400 microns to proceed with UV-A irradiation.
If the corneal thickness meets this criterion, the second stage, UV-A light therapy, is initiated. The duration of UV-A irradiation varies, typically ranging from 3 to 30 minutes. Under the standard protocol, UV-A irradiation lasts 30 minutes, a duration often preferred for patients under 18 years of age, who are at higher risk of disease progression. For adult patients, accelerated protocols (with irradiation times of 9-10 minutes) are increasingly favored today. During the second stage, riboflavin solution continues to be applied to the cornea every two minutes while UV-A irradiation is administered.
Upon completion of the procedure, the cornea is thoroughly irrigated, thickness is re-measured, and a bandage contact lens is placed on the eye. This contact lens remains in place until epithelial healing is complete, typically by the third or fourth day, after which it is removed.