Non-invasive Induction of Metaplasticity for Amblyopia

The goal of this clinical trial is to determine the efficacy of flicker therapy as an adjunct therapy to treat amblyopia beyond the critical period in adolescents and adults aged 14-40 years who have amblyopia of ≥3 lines of interocular best-corrected (with glasses) visual acuity difference. The main questions it aims to answer are: * Does flicker therapy enable clinically meaningful and durable visual recovery from amblyopia? * Do flicker therapy-treated patients show a change in amblyopic eye visual acuity (lines)? Participants will undergo daily flicker therapy for 1 hour per day.