Figure 4
From: Corneal cross-linking in 9 horses with ulcerative keratitis
Corneal collagen cross-linking. A handheld UVA-light source was employed to irradiate the corneal ulcer during 30 minutes. The edge of the light beam was sharply circumscribed when the lamp was held at a distance of 5 cm from the corneal surface, which enhanced maintaining the correct distance between the lamp and the patient’s eye.