Case Western Reserve University

Bringing Functional Vision Testing Into Clinical Practice

Minzhong Yu’s career has been shaped by several defining moments. During his master’s, doctoral, and postdoctoral training in visual electrophysiology, he witnessed firsthand how technologies such as the electroretinogram (ERG) and visual evoked potential (VEP) could detect dysfunction long before anatomical changes became visible. Later, when he began working directly with patients—particularly those with inherited retinal diseases or ambiguous visual complaints—he fully recognized the irreplaceable role of objective functional testing. These experiences cemented his conviction that electrophysiological testing should serve as a core pillar of ophthalmic diagnostics rather than remain a niche specialty.

Ophthalmic electrophysiology is transitioning from a research-dominated field to a more integral part of clinical practice. Advances in multifocal ERG, pattern ERG and quadrant VEP have allowed for region-specific, cell-specific and pathway-specific assessment of retinal and optic nerve function. These tools are increasingly valuable in early diagnosis of diseases like retinitis pigmentosa, cone-rod dystrophy, optic neuropathies and even functional vision loss.

Critically, electrophysiology provides objective and quantifiable functional biomarkers—complementing OCT, fundus imaging and genetics. This is especially important for early-stage disease detection, therapeutic monitoring and eligibility assessment for clinical trials involving gene therapy or neuro-protective agents. In some cases, electrophysiology has made the difference between diagnosis and prolonged uncertainty for patients.

Overcoming Barriers to Implementing Advanced Ophthalmic Diagnostic Technologies

The primary challenges are awareness, training, and workflow integration. Electrophysiology requires not only technical precision but also interpretive expertise—skills that are not widely taught in U.S. ophthalmology residency programs. To address this, he’s worked on standardizing testing protocols based on ISCEV (International Society for Clinical Electrophysiology of Vision) guidelines and implementing cross-department collaborations to ensure electrophysiological data are integrated into diagnostic pathways. They’ve worked to streamline their workflow, integrate results into electronic health records and educate referring providers on the clinical utility of these tests.

Several transformative trends are emerging:

1. AI-assisted analysis of electrophysiology waveforms and multimodal imaging will enhance diagnostic precision and reduce inter-reader variability.

2. Portable and wearable electrophysiology devices may soon enable point-of-care functional testing, even in underserved or remote settings.

3. Functional biomarkers validated through ERG or VEP may serve as endpoints in clinical trials, especially in gene or cell therapies for retinal diseases.

4. Integration with genetic testing and advanced imaging will create a more holistic, systems-level approach to diagnosis, prediction, and personalized treatment.

Collectively, these developments will shift ophthalmic diagnostics from reactive to proactive, allowing for earlier intervention and better long-term outcomes.

Essential Competencies for the Next Generation of Ophthalmic Innovators

Curiosity, interdisciplinary thinking, and a strong foundation in both basic science and clinical translation are essential. Vision science is inherently interdisciplinary—it spans neurobiology, physics, engineering, and medicine. Those who can bridge these domains will be best positioned to innovate.

He also encourages trainees to develop competency in electrophysiology, quantitative data analysis, and imaging interpretation. More importantly, they should cultivate empathy and clinical insight. The most impactful innovations are born not just from technological curiosity, but from a deep understanding of unmet patient needs.

Ophthalmic electrophysiology is not just about waveform analysis—it’s about giving patients answers when conventional imaging or clinical exams fall short. As technologies evolve, he believes functional diagnostics will play an increasingly central role in precision eye care. He’s honored to contribute to this transition and look forward to continued collaboration across disciplines.