Related Experiment Video
Updated: Apr 16, 2026
Assessing Early Stage Open-Angle Glaucoma in Patients by Isolated-Check Visual Evoked Potential
Published on: May 25, 2020
Visually evoked potentials in a patient with a fyodorov-zuev keratoprosthesis
Roy Schwartz1, Adiel Barak1, Hadas Newman1
1Department of Ophthalmology, Tel Aviv Medical Center, and Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel.
Purpose:
To describe a visually evoked potential (VEP) examination performed on a patient with a keratoprosthesis.
Methods:
We report the case of a 60-year-old patient with a Fyodorov-Zuev keratoprosthesis in the right eye complained of gradual visual deterioration in that eye. His past medical history consisted of failed corneal graft procedures due to corneal dystrophy and an Ahmed valve implantation due to secondary glaucoma. A clinical examination and an ultrasound demonstrated vitreal opacities. In order to assess the visual status, a flash VEP test was conducted.
Results:
VEP recorded from the right eye consisted of a broadened and poorly formed positive P1 wave, with a subnormal amplitude, but a normal latency. Consequently, the patient underwent a pars plana vitrectomy.
Conclusion:
This case demonstrates the viability of VEP exams in patients with keratoprostheses.
