Accommodative amplitudes in the Early Treatment Diabetic Retinopathy Study

Area of Science:

• Ophthalmology
• Diabetology
• Vision Science

Background:

• Diabetes mellitus is a systemic disease affecting multiple organs, including the eyes.
• Accommodative amplitude, the eye's ability to change focus, can be impacted by diabetes.
• The Early Treatment Diabetic Retinopathy Study (ETDRS) provides a valuable dataset for investigating such impacts.

Purpose of the Study:

• To investigate accommodative amplitude in individuals with diabetes.
• To identify risk factors associated with reduced accommodative amplitude in diabetic patients.
• To evaluate the effect of scatter photocoagulation on accommodative amplitude.

Main Methods:

• Analysis of baseline accommodative amplitude in 1,058 diabetic patients (<46 years, good visual acuity) from the ETDRS.
• Multivariable linear regression to identify risk factors for low baseline accommodative amplitude.
• Paired t tests and repeated measures ANOVA to assess changes in accommodative amplitude at 4 months post-photocoagulation in 578 patients.

Main Results:

• Diabetic patients exhibited lower accommodative amplitudes compared to normal values.
• Older age and longer diabetes duration were significant risk factors for reduced accommodative amplitude (P < 0.001 and P < 0.01, respectively).
• Scatter photocoagulation was associated with a transient, approximately 0.33 diopter, reduction in accommodative amplitude at 4 months (P < 0.001).

Conclusions:

• Diabetes, duration of diabetes, and age are significant risk factors for diminished accommodative amplitude.
• Scatter photocoagulation may lead to a temporary decrease in the eye's focusing ability.
• These findings are crucial for managing the visual and accommodative needs of diabetic patients and understanding photocoagulation side effects.