Computer Vision Syndrome Impairs Visual Quality, Suggests Study

As digital screen time rises, research has predominantly focused on ocular surface issues, leaving a clinical gap in understanding the impact on functional vision. To address this, Varnika A. Singh and colleagues from the Government Medical College and Hospital, Chandigarh, investigated multidirectional contrast sensitivity and wavefront errors in young adults to better characterize visual dysfunctions in computer vision syndrome.

Therefore, the prospective case-control study compared 110 eyes of CVS patients against healthy controls at a tertiary institute. Utilizing wavefront aberrometry and SPARCS, investigators excluded prior surgeries and high refractive errors to specifically measure the impact of digital strain on functional vision.

Key Clinical Findings of the Study Includes:

• Reduced Functional Contrast: Total SPARCS scores were significantly lower in the affected group at 81.79 compared to 85.39 in controls, highlighting that digital strain compromises the ability to detect subtle visual details that standard acuity charts often miss.

• Elevated Optical Aberrations: Digital device users exhibited a dramatic increase in higher-order aberration percentage at 32.80% versus 12.43% in the healthy group, indicating substantial retinal image distortion in symptomatic patients.

• Marked Spherical Distortion: Mean spherical aberration was significantly higher in symptomatic users at 0.0137 than in healthy subjects at 0.0041, likely resulting from central tear-film instability and evaporation during prolonged near-work sessions.

• Evaporative Surface Stress: Ocular surface evaluations confirmed that 62.7% of symptomatic users suffered from moderate dry eye disease (DED), primarily of the evaporative type, as evidenced by significantly reduced tear-film breakup times.

• Peripheral Visual Loss: Beyond central vision, the study identified significant contrast deficits across multiple peripheral quadrants, demonstrating a widespread impact on visual quality and daily functioning.

The results suggest that individuals suffering from computer vision syndrome experience a measurable decline in visual quality through the combined effects of ocular surface instability, a substantial 20% increase in higher-order aberrations, and a significant reduction in multidirectional contrast sensitivity.

Thus, the study concludes clinicians should consider that managing digital eye strain requires looking beyond simple visual acuity and treating the underlying evaporative dry eye while potentially utilizing advanced contrast sensitivity tools to monitor functional visual recovery.

The study was limited by its observational nature and the lack of a direct correlation between aberrations and contrast loss, indicating a need for future longitudinal research to explore additional factors such as retinal blue light exposure and its long-term effects on visual health.

Reference

Singh VA, Ichhpujani P, Singh T, Kumar S, Kaur N. Associations between ocular surface parameters, contrast sensitivity, and higher-order aberrations in computer vision syndrome. Indian J Ophthalmol 2026;74:104-10.