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The Science Behind Adult Amblyopia Training

What studies show (and don't) about vision training for adult lazy eye — with links to every source, including trials with negative results.

The old view: "too late after childhood"

For decades, the standard view was that amblyopia could only be treated in early childhood. Many adults were told nothing more could be done. Research over the past twenty years has looked at that question again.

What research suggests for adults

  • Research suggests the adult visual brain can still improve. In a 24-study review, adults gained an average of 0.17 logMAR (about 1.7 chart lines) with structured visual training.1
  • In one study, 74% of adults who played a dichoptic video game for 40 hours improved by at least one line on an eye chart.2 (One small study of 23 adults, not a typical or promised result.)
  • Studies have reported improvements in 3D depth perception (stereoacuity) after dichoptic training.2,5
  • In studies, most training gains were largely retained months after training ended.2,6

Dichoptic training and FDA-cleared children's devices

Dichoptic, two-eye training has been FDA-cleared as a treatment for children with amblyopia: Luminopia (ages 4 to under 13, expanded from 4–7 in 2025) and CureSight (ages 4 to under 9).3,4 Eyeletics builds on the same research principles for adults. Eyeletics itself is not FDA-cleared or approved, and those devices are not cleared for adults.

Consistency matters

In clinical trials, results depended on how much people actually trained.7,8 In one large children's trial (ATS18), adherence to the game was low, and patching did slightly better than the game.7

The honest limits

The largest masked trial that included adults (BRAVO, 2018) found that its dichoptic game worked no better than a placebo game; the researchers called for more engaging games and better ways to track training time.8 Most adult evidence comes from small, unmasked studies. Average adult gains are around 1 to 2 lines, results vary widely, and some people don't improve.

Safety

No serious adverse events were reported in the Luminopia or CureSight trials. Trials have reported uncommon side effects such as temporary double vision or eye strain. Stop training and contact your eye doctor if you notice double vision, eye pain, or sudden vision changes. Use alongside, not instead of, your glasses and regular eye exams.9

Individual results vary. Eyeletics is a wellness and training program, not a medical device, and does not diagnose or treat any disease.

Sources

  1. Tsirlin I, et al. (2015). Behavioral training as new treatment for adult amblyopia: a meta-analysis. PubMed 26114483
  2. Vedamurthy I, Levi DM, et al. (2015). A dichoptic custom-made action video game as a treatment for adult amblyopia. Vision Research. Europe PMC; Sci Rep 2015
  3. FDA De Novo DEN210005, Luminopia One (2021, children 4–7) FDA; indication expanded to ages 4 to <13 by 510(k) K243819 (cleared Apr 9, 2025) FDA
  4. FDA 510(k) K221375, CureSight (children 4 to <9, cleared Sep 29, 2022). FDA
  5. Li J, Hess RF, et al. (2013). Dichoptic training enables the adult amblyopic brain to learn. Current Biology. Cell
  6. Polat U, et al. (2004). Improving vision in adult amblyopia by perceptual learning. PNAS. PubMed 15096608
  7. Holmes JM, et al. (2016). PEDIG ATS18 binocular iPad treatment vs patching. JAMA Ophthalmology. JAMA
  8. Gao TY, et al. (2018). BRAVO randomized clinical trial. JAMA Ophthalmology. JAMA — the largest masked adult-inclusive trial: no benefit over a placebo game.
  9. All cited trials used optical correction (glasses) alongside training.

Last reviewed: TBD · Medically reviewed by: TBD — licensed OD/MD reviewer