What is dichoptic training? How it differs from patching

Every family has heard of patching; dichoptic training is new to most. Yet it has been one of the most notable threads in amblyopia research over the past fifteen years: instead of working the weak eye alone, it brings both eyes together on the same task.

This article explains the logic of the method, how it differs from patching, and what the research has said so far. It is for information; which method suits your child is your eye doctor's decision.

Lazy eye is usually described simply as one eye seeing less, but the problem has a second layer. To avoid confusion, the brain has learned to suppress the picture from the weaker eye; the two eyes' teamwork (binocular vision and depth perception) takes a hit from that suppression too.

Patching targets the first layer: the strong eye is covered and the weak eye works alone. But while the patch is on, the two eyes never work together for a single moment; the teamwork layer is not being exercised directly.

The word dichoptic means showing each eye a separate image. Through a separator such as red-blue filter glasses, each eye sees only its own share of the scene on screen; the game or task can only be completed once the two parts merge in the brain.

In most implementations, the content shown to the strong eye has its contrast reduced, so the weaker eye's signal stands out and the suppression is encouraged to relax. As progress builds, that contrast gap is narrowed.

With a patch, one eye works; in dichoptic training, both do, together. The target differs too: patching aims at visual acuity, while dichoptic training additionally aims at suppression and the eyes' cooperation.

The experience differs as well: a patch stays on for hours and is something a child endures; a dichoptic session is a comparatively short, interactive stretch at a screen. And the social weight of wearing a patch at school is absent.

These differences are why research keeps moving toward approaches that put both eyes to work together. In some cases doctors also combine the two.

The evidence behind dichoptic training is growing fast: large randomized controlled trials have been published (Xiao et al., Ophthalmology, 2022), a multicenter randomized trial found digital dichoptic treatment no worse than patching in children (Wygnanski-Jaffe et al., Ophthalmology, 2023), and there is evidence the adult brain can respond to this kind of training as well (Li et al., Current Biology, 2013).

The second theme running through these trials is adherence. When patching is measured with dose monitors, children prescribed 6 hours a day received a mean of 4.2 hours (Stewart et al., BMJ, 2007). In the dichoptic video trial that compared directly against patching, adherence measured 91% against 83%, and the equivalent visual gain came on roughly half the hours prescribed for patching (Wygnanski-Jaffe et al., Ophthalmology, 2023).

In short: dichoptic training has moved to the center of amblyopia research, with strengthening evidence behind it. Which approach your child gets is a decision made together with your doctor.

In practice it takes the form of short screen sessions with red-blue (or similar separator) glasses, typically around half an hour a day. Whatever the method, one rule never changes: the effect comes from regular repetition.

If you are considering a dichoptic program, discuss it with your eye doctor; progress tracked through check-ups is the safe foundation under any work done at home.