Protective Shield Placed On The Optical Cylinder In Patients After Osteo-Odonto-Keratoprosthesis (Ookp)

PMMA optic scratches following OOKP surgery is a significant complication that can reduce vision substantially. We describe four cases of patients post- Osteo/odonto-keratoprosthesis (O/OKP) in which a cellphone Silicon protective shield was cut and placed on the optical cylinder of their prostheses. This served as a treatment for severly scratched OOKP optic, and in other otherwise un-scratched  OOKP optic - served to prevent future abrasions. 

Rabin Medical Center - tertiary medical institute, Israel

Retrospective observational case series of four patients post O/OKP preformed between 2019 – 2022. In all cases, a protective silicone cellphone screen shield was cut using a 3mm dermal punch and placed on the prosthesis optical cylinder. In one case (case 1), the protective shield smoothed a severely abrased optic cylinder and improved the patients' vision, and in the other three cases the protective shield was places to prevent future optical scratches and abrasions.

In case 1 that presented with severe abrasion and deep scratches post OOKP, the Silicon shield improved the patients' BCVA from 6/20 to 6/8.5. In the other 3 cases (in which the optical cylinder was not abrased) – the Silicon shield was placed to prevent future abrasion and did not change the baseline BCVA nor the refraction.

Placing a soft silicon protective shield (originally made for cellphones) on the optic cylinder in patients post O/OKP procedure - helps to improve BCVA in patients with scratched optical cylinder and to prevent abrasions in an otherwise non-abrased optical cylinder. Placement of this shield is easy, cheap, safe and does not reduce BCVA nor changes the refraction in these patients.