The training of visual acuity in myopia

Area of Science:

• Ophthalmology
• Optometry
• Vision Science

Background:

• Myopia, or nearsightedness, significantly impacts visual acuity.
• Current myopia control strategies aim to slow progression but visual acuity improvement is a distinct goal.
• Understanding mechanisms for temporary visual acuity enhancement is crucial for myopia management.

Purpose of the Study:

• To investigate the potential for improving far-point visual acuity in myopic individuals through targeted training.
• To explore the underlying physiological or perceptual mechanisms responsible for any observed visual acuity changes.
• To assess whether visual acuity improvements correlate with changes in refractive error.

Main Methods:

• Seventeen participants with myopia underwent training using a computerized optometer.
• Training focused on enhancing far-point visual acuity under controlled conditions, including management of "squinting" and pupil size.
• Refraction and tear film characteristics were assessed.

Main Results:

• Participants achieved significant improvements in far-point visual acuity, reaching up to 20/25 from 20/800 for limited periods.
• No associated changes in the participants' refractive error were detected.
• The observed improvements are hypothesized to result from an "artificial contact lens" effect induced by changes in the tear film.

Conclusions:

• Computerized optometer training can temporarily enhance visual acuity in myopic individuals without altering refractive error.
• Tear film alterations, potentially forming an artificial contact lens, are the likely mechanism for visual acuity improvement.
• Further investigation using contrast sensitivity testing is recommended to determine if learned perceptual processes also contribute to these findings.