Evaluation of anterior chamber depth in aphakic and pseudophakic patients with Boston type 1 keratoprosthesis

Purpose To assess anterior chamber depth in aphakic and pseudophakic patients with Type 1 Boston Keratoprosthesis using anterior segment optical coherence tomography. Methods Sixteen patients who underwent Boston Type 1 Keratoprosthesis implantation were evaluated for anterior chamber depth by the non-contact technique of AS-OCT. Longitudinal cuts were used in evaluation of AC depth. Functional AC depth was defined as the distance between the back plate of the KPro and the anterior surface of the iris. Anatomic AC depth was defined as the distance from the posterior surface of donor cornea to the iris. Both functional and anatomic AC depths were measured nasally and temporally. The distance between the back plate of the KPro and anterior surface of the posterior chamber intraocular lens (PCIOL) was also measured in pseudophakic patients. Results A total of 16 patients were included in this study. There were 9 pseudophakic and 7 aphakic patients. Anatomic AC depths ranged between 0.86mm to 3.2mm. Functional AC depths ranged from 0mm to 2.2mm. Pseudophakic patients had anatomic AC depths between 0.92mm and 3.1mm and functional AC depths between 0mm and 2.2mm. Aphakic patients had anatomic AC depths between 0.86mm and 3.2mm, and functional AC depths between 0mm and 2.2mm. The distance between the back plate of the KPro and PCIOL in pseudophakic patients ranged from 0.14mm to 2mm. Conclusion Anterior chamber depth measurement, combined with AC angle data provide valuable information in the setting of KPro implantation. This may be helpful in monitoring patients post-operatively for anterior segment complications such as crowding of the AC, or occlusion of the angle.