Comparison of objective refraction in darkness to cycloplegic refraction: a pilot study

Area of Science:

• Ophthalmology
• Optometry
• Vision Science

Background:

• Assessing refractive error in children and young adults often requires cycloplegic eye drops.
• Conventional methods include subjective refraction and retinoscopy under cycloplegia.
• Objective, non-cycloplegic methods are sought as potentially more convenient alternatives.

Purpose of the Study:

• To evaluate non-cycloplegic objective refraction in darkness using an open-field autorefractor.
• To compare this method with traditional distance cycloplegic subjective refraction and retinoscopy.
• To determine the reliability of the non-cycloplegic method in children and young adults.

Main Methods:

• Visually normal young adults (23-31 years) and children (5-12 years) participated.
• Refractive error was measured using three techniques: non-cycloplegic objective autorefraction in darkness, distance cycloplegic subjective refraction, and distance cycloplegic retinoscopy.
• All measurements were taken within a single session on the same day.

Main Results:

• No significant differences in spherical refractive component were found among the three techniques for either adults or children.
• High correlations were observed between non-cycloplegic objective refraction in the dark and both cycloplegic methods.
• Mean differences in spherical component were small, indicating good agreement between methods.

Conclusions:

• Non-cycloplegic objective refraction in darkness is comparable to conventional cycloplegic refraction methods.
• This technique shows high correlation with established methods in both pediatric and young adult populations.
• It may serve as a reliable adjunct or alternative to cycloplegic refraction.