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R. Cannata, S. Salvatore, I. Girolami, E. M. Vingolo; Acoustic Biofeeback Training in High Myopic Eyes. Invest. Ophthalmol. Vis. Sci. 2009;50(13):3960.
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To evaluate if visual training biofeedback by means of Visual Pathfinder (LACE inc.) system may be useful in improving visual function in visually impaired patients with high myopia.
We enrolled 17 patients (31 eyes; age range 35-57) with high myopia (range 9-15 D). All the patients underwent a complete ophthalmologic evaluation which comprised the assessment of best corrected visual acuity (BCVA), pattern reversal visual evoked potential (VEP) according to the ISCEV standards and microperimetry (MP-1 Nidek Technologies, Padua, Italy). All the patients underwent 10 training sessions of 10 minutes each eye performed once a week using the Visual Pathfinder every three months. Follow-up time varied from patient to patient (range 3 months- 3 years). Statistical analysis was performed using the Student’s t-test. P values less than 0.05 were considered statistically significant.
Mean BCVA was 0.23± 0.39 logMAR at the baseline, and 0.04± 0.65 logMAR at the end of visual training (p=0.041). VEP amplitude was 3.54±1.90 mV at baseline, and 6.64±2.91 mV at the end of visual training (p=0.012). Mean retinal sensitivity (6° diameter circle) was 8.6±5.6 dB at baseline, and 11.3 ±6,24 dB at the end of the training (p=0.036). Fixation behaviour within 2° diameter circle was 37±31 % at baseline and 45± 30% at the end of the training (p=0.043). All results were statistically significant.
In conclusion our experience demonstrates that in high myopia acoustic biofeedback visual training can significantly improve BCVA, pattern reversal VEP amplitude, fixation behaviour and retinal sensitivity, resulting in more suitable visual performances, better quality of life, and a much more positive psychological feeling for these patients.
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