Objectively monitored patching regimens for treatment of amblyopia: randomised trial

Area of Science:

• Ophthalmology
• Pediatric Medicine
• Clinical Trials

Background:

• Amblyopia, or 'lazy eye,' is a common cause of reduced vision in children.
• Treatment often involves patching the stronger eye to encourage development of the weaker, amblyopic eye.
• Determining optimal patching duration is crucial for effective treatment and patient compliance.

Purpose of the Study:

• To compare the visual outcomes of amblyopia treatment using two prescribed daily occlusion durations: 6 hours versus 12 hours.
• To assess the relationship between prescribed occlusion time and actual adherence.
• To identify factors influencing treatment effectiveness, such as age.

Main Methods:

• An unmasked randomized trial was conducted with 97 children diagnosed with amblyopia.
• Participants underwent 18 weeks of refractive adaptation followed by prescribed occlusion (patching) for 6 or 12 hours daily.
• Visual acuity was measured using logMAR letter recognition, and occlusion adherence was objectively monitored.

Main Results:

• No significant difference in visual acuity improvement was observed between the 6-hour and 12-hour occlusion groups.
• Actual mean occlusion time was significantly less than prescribed in both groups, with the 12-hour group receiving only slightly more patching than the 6-hour group.
• Visual outcomes were similar for children patching 3-12 hours daily but significantly better than those patching <3 hours. Younger children (<4 years) required less occlusion.

Conclusions:

• Prescribing 6 hours (substantial) or 12 hours (maximal) of daily occlusion results in comparable visual outcomes for amblyopia treatment.
• Adherence to prescribed occlusion is often lower than intended, suggesting that prescribed durations may be overestimated.
• Treatment effectiveness is linked to actual hours patched, with younger children benefiting from shorter durations.