psychogenic amblyopia
Psychogenic amblyopia, also called hysterical amblyopia, is reduced vision of psychological origin, a visual conversion reaction with no organic cause.1 Psychogenic amblyopia belongs to the wider group of functional, or nonorganic, visual loss, meaning measured vision loss that no lesion of the visual pathways explains.2 That group also includes malingering, the willful feigning of vision loss for secondary gain, whereas a patient with a conversion reaction honestly believes in the disability.2,3
Patients with a conversion reaction are reacting to environmental stress, and adolescents seem particularly prone.3 In children the triggers are often social, such as conflict with parents, divorce or a move to a new school, while adults have often suffered a traumatic event.2 About one-third of cases affect one eye only, which invites confusion with true amblyopia.4
Acuity is reduced but variable, inconsistent at different distances and prone to suggestion.1 Kinetic perimetry may show a star or spiral field, and on the tangent screen a tunnel field keeps the same absolute size at every test distance.1,3 Psychogenic amblyopia is a diagnosis of exclusion, and as many as half of patients with functional visual loss also have true organic disease.2,3
More detail
One acuity technique starts at the 20/10 line and works upward while the examiner shows concern at each missed letter.3 By the 20/20 or 20/25 line, the power of suggestion usually convinces the patient that the letters are large enough to read.3 Testing the field at two distances matters because end-stage glaucoma, end-stage papilledema and other organic disease can produce real generalized constriction.3
Management starts with empathy and encouragement rather than confrontation.2 The examiner tells the patient that the eyes and optic nerves look healthy and that similar patients often improve with time.2 Hypnosis and psychoanalysis can be tried, yet most patients with functional visual loss neither require nor benefit from psychiatric intervention.2 In children the clinician explains the findings to the parents, encourages the child, and schedules review in about 3 months, and a lack of improvement by then suggests organic disease.2 The prognosis in children is excellent, and in one series one-third were better within 1 day and three-quarters by 2 months.2
Sources (9)
- Pickwell's Binocular Vision Anomalies, ch. 13
- Liu, Volpe and Galetta, Neuro-Ophthalmology: Diagnosis and Management, ch. 11
- Yanoff and Duker, Ophthalmology (2023), ch. 9
- Pickwell's Binocular Vision Anomalies, ch. 2
- Beatty, S. (1999) 'Non-organic visual loss', Postgraduate Medical Journal, 75(882), pp. 201–207.
- Lim, S.A., Siatkowski, R.M. and Farris, B.K. (2005) 'Functional visual loss in adults and children patient characteristics, management, and outcomes', Ophthalmology, 112(10), pp. 1821–1828.
- Rutstein, R., Daum, K. (1997) Anomalies of Binocular Vision: Diagnosis & Management, Mosby, pp. 347.
- Villegas, V.M. and Kattah, J.C. (2013) 'Non-organic visual loss', Current Opinion in Ophthalmology, 24(6), pp. 512–517.
- Yeo, J.M., Carson, A. and Stone, J. (2019) 'Seeing again: treatment of functional visual loss', Practical Neurology, 19(2), pp. 168–172.
Reviewed October 2026