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Reducing the lag of accommodation by auditory biofeedback: A pilot study.

Sandra Wagner¹, Arne Ohlendorf², Frank Schaeffel³

¹Institute for Ophthalmic Research, Eberhard Karls University Tuebingen, Elfriede-Aulhorn-Straße 7, 72076 Tuebingen, Germany; Carl Zeiss Vision International GmbH, Turnstrasse 27, 73430 Aalen, Germany; Aalen University, Anton-Huber-Straße 23, 73430 Aalen, Germany.

Vision Research

|November 7, 2016

Summary

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Auditory biofeedback may improve accommodative accuracy in some individuals with myopia, potentially reducing accommodative lag. However, these effects are variable and not sustained long-term.

Area of Science:

Ophthalmology
Vision Science
Neuroscience

Background:

Accommodative lag, a common issue in myopia, can impact visual function.
Training visual systems may offer therapeutic benefits for refractive errors.

Purpose of the Study:

To determine if auditory biofeedback can train accommodative accuracy and reduce accommodative lag in young adults with myopia.
To assess the efficacy of different auditory biofeedback training durations.

Main Methods:

Thirty-one myopic adults were divided into experimental (auditory biofeedback) and control groups.
Accommodation responses were measured using an infrared photorefractor at various dioptric distances.
Two training protocols were used: continuous (200s) and intermittent (10x20s sessions).

Keywords:

Biofeedback Eccentric photorefraction Lag of accommodation Myopia Vision training

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Main Results:

Training effects on accommodative lag were highly variable across participants.
A reduction in accommodative lag (≥0.3D) was observed in 7 experimental subjects at closer distances (≤2.5D).
Observed training effects were not preserved after 5-7 days.

Conclusions:

Auditory biofeedback can enhance accommodative accuracy in some individuals with myopia, particularly at closer target distances.
The training benefits are subject-specific and temporary, suggesting limitations for sustained clinical application.
Further research is needed to optimize biofeedback protocols for lasting improvements in accommodative function.