According to recent studies, an increase in corneal stiffness is a promising alternative for avoiding ectasias and for stagnating keratoconus of grades 1 and 2. The clinical treatment consists essentially of instilling Riboflavin (vitamin B2), in the cornea and then irradiating the corneal tissue, with UVA (365nm) radiation at 3mW/cm2 for 30min. This procedure provides collagen cross-linking in the corneal surface, increasing its stiffness. This work presents a system for UVA irradiation of the corneas at a peak wavelength of 365nm with adjustable power up to 5mW. The system has closed loop electronics to control the emitted power with 20% precision from the sated power output. The system is a prototype for performing corneal cross-linking and has been clinically tested. The closed loop electronics is a differential from the equipments available on the market.

Date Published: 18 February 2009
PDF: 7 pages
Proc. SPIE 7163, Ophthalmic Technologies XIX, 71631L (18 February 2009); doi: 10.1117/12.806821

Published in SPIE Proceedings Vol. 7163:
Ophthalmic Technologies XIX
Fabrice Manns; Per G. Söderberg; Arthur Ho, Editor(s)