Distant cancer effects on standardised testing of peripheral vision

Area of Science:

• Ophthalmology
• Oncology
• Retinal Diseases

Background:

• Cancer and melanoma-associated retinopathies (CAR, MAR) typically present with profound central-retinal visual loss.
• Standardized tests of peripheral retinal function are more sensitive in detecting early eye disease.
• This study investigates peripheral retina responsiveness to distant cancers.

Purpose of the Study:

• To assess peripheral retinal function in cancer patients using standardized tests.
• To determine if peripheral retinal abnormalities correlate with the presence of distant cancers.
• To differentiate peripheral retinal changes from central vision losses in CAR/MAR.

Main Methods:

• A single-blind study comparing 25 cancer patients' test results with published norms and a control group.
• 111 out of 120 ambulatory cancer outpatients reported mild visual changes.
• Tests focused on peripheral vision, including dark adaptation, blue-sensitive cell function, and electroretinogram oscillatory potentials (OP).

Main Results:

• 92% of eyes in cancer patients showed quantitative peripheral vision abnormalities (>2 SD from norm).
• Abnormalities were most frequent in dark adaptation (62%), blue-sensitive cells (34%), and ERG OP (46%).
• Central retinal examinations judged 98% of eyes as clinically normal.

Conclusions:

• Cancer-associated retinal deficits (CARD) are prevalent in the peripheral retina of cancer patients.
• Peripheral retinal dysfunction is distinct from central vision loss in CAR/MAR.
• Peripheral retinal testing holds potential clinical utility for early cancer detection and monitoring.