Argon Laser Iridoplasty for Optic Obstruction of Boston Keratoprosthesis

Figure 1. Improved iris-keratoprosthesis (KPro) optic obstruction after argon laser peripheral iridoplasty. A, Slitlamp photograph of the first patient before argon laser iridoplasty, with the iris obstructing the nasal and superotemporal Boston KPro optic. B, Slitlamp photograph of the patient, with minimal iris remaining in the superonasal quadrant of optic. C and D, Before laser and after laser anterior segment optical coherence tomography at the 90° meridian with radially measured iris–Boston KPro touch of 1.28 mm (before) and 0.18 mm (after) in the visual axis. E and F, Before laser and after laser Goldmann visual field demonstrating stable peripheral field with V-4-e and III-4-e targets. BP indicates back plate; CO, donor cornea.

Figure 2. Improved iris-keratoprosthesis (KPro) optic obstruction after argon laser peripheral iridoplasty. A, Slitlamp photograph of the second patient before argon laser iridoplasty, with the iris obstructing the inferior Boston KPro optic. B, Slitlamp photograph of the patient with retraction of the inferior iris after argon laser iridoplasty. C and D, Before laser and after laser anterior segment optical coherence tomography at the 225° meridian with radially measured iris–Boston KPro touch obstructing the Boston KPro optic by 0.70 mm (before) and 0.29 mm (after). E and F, Before laser and after laser Humphrey visual field 24-2 threshold protocol with size V stimulus showing expansion of inferior visual field, although with fixation losses. BP indicates back plate; CO, donor cornea.