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Detecting Visual Function Abnormality with a Contrast-Dependent Visual Test in Patients with Type 2 Diabetes.

Li-Ting Tsai1,2, Kuo-Meng Liao3, Yuh Jang2

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The Macular Multi-Function Assessment (MMFA) effectively evaluates contrast-dependent vision in type 2 diabetes patients, showing high agreement with existing tests and detecting early visual changes.

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Area of Science:

  • Ophthalmology
  • Diabetology
  • Visual Neuroscience

Background:

  • Diabetes mellitus, particularly type 2, causes significant visual deficits beyond diabetic retinopathy, including early retinal neurodegeneration.
  • Traditional visual acuity tests may not capture the full spectrum of visual impairments caused by diabetes.
  • Assessing contrast-dependent macular function is crucial for understanding subtle visual changes.

Purpose of the Study:

  • To validate the Macular Multi-Function Assessment (MMFA) against the Early Treatment Diabetic Retinopathy Study (ETDRS) contrast acuity charts.
  • To evaluate the MMFA's ability to discriminate between diabetic patients and healthy controls.
  • To assess contrast-dependent visual function in type 2 diabetes patients using the MMFA.

Main Methods:

  • Comparison of MMFA and ETDRS contrast acuity charts using linear mixed-effect models and intraclass correlation coefficients (ICCs).
  • Assessment of discriminative ability using receiver operating characteristic (ROC) curves.
  • Evaluation of MMFA symbol discrimination performance at four contrast levels in 77 diabetic patients and 45 controls, adjusting for covariates.

Main Results:

  • High agreement was found between MMFA and ETDRS scores.
  • Both tests demonstrated acceptable and similar discriminative ability between diabetic patients and controls.
  • MMFA performance correlated with diabetic retinopathy severity, with significantly lower scores in diabetic patients, especially under low contrast conditions.

Conclusions:

  • The MMFA is a reliable tool for assessing contrast-dependent visual function in type 2 diabetes.
  • The MMFA shows potential as an accessible screening tool for detecting early, subtle visual impairments in diabetic individuals.
  • The MMFA provides valuable insights into visual deficits beyond standard visual acuity measurements.