Method of determining a patient's subjective refraction based on objective measurement

Area of Science:

• Ophthalmology
• Optometry
• Vision Science

Background:

• Accurate refractive error correction is crucial for visual acuity.
• Manifest refraction, a subjective method, is the current standard for determining refractive error.
• Objective methods for refractive error assessment are sought to improve efficiency and accuracy.

Purpose of the Study:

• To develop and validate an objective method for predicting manifest refraction using wavefront sensing.
• To test the hypothesis that optimal refractive correction corresponds to the most stable state of the eye's optical power, characterized by minimal wavefront aberration fluctuations.

Main Methods:

• Wavefront sensing was performed on nine patients using a grating-based instrument.
• Defocus power was added binocularly in increments (+/- 1.00 D, +/- 0.50 D, plano).
• Vision fluctuation was measured by the standard deviation of total root mean square wavefront error.

Main Results:

• The point of minimal vision fluctuation (optimal refractive correction) was found within -0.10 D to +0.30 D.
• The mean difference between manifest refraction and the determined stable point was 0.14 D.
• Objective measurement of vision fluctuation showed good agreement with manifest refraction.

Conclusions:

• Objective monitoring of vision fluctuation shows potential for accurate manifest refraction prediction.
• Further validation with larger sample sizes and finer defocus steps is recommended.
• This objective method may offer a more efficient and reliable approach to refractive error assessment.