Accommodative Anomalies and Vision Therapy: Insufficiency, Excess, Infacility and Spasm
Last updated: November 2026
RPC Rounds for Optometrists · B.Optom study guide
Many children and young adults with headaches and blur at near have normal acuity and a normal refraction, but their accommodation does not work as it should. Accommodative anomalies are common, easy to test for, and usually respond to a near add or vision therapy.
Types and how to recognise them
| Anomaly | Key findings | Management |
|---|---|---|
| Accommodative insufficiency | Amplitude below the minimum for age (Hofstetter: 15 − 0.25 × age); high lag on MEM; fails minus lenses on facility; low PRA | Correct any hyperopia; plus add for near (for example +0.75 to +1.25); vision therapy |
| Ill-sustained accommodation (fatigue) | Normal amplitude at first, falls with repeated testing; symptoms later in the day | Treat like insufficiency |
| Accommodative infacility | Normal amplitude but slow to change focus: fails both plus and minus on ±2.00 D flippers (under about 11 cycles/min monocularly in young adults) | Vision therapy (flippers, Hart charts) |
| Accommodative excess | Low NRA, lead or low lag on MEM, fails plus lenses on facility, variable distance blur, pseudomyopia | Cycloplegic refraction to exclude latent hyperopia; relaxation therapy; avoid overminus |
| Spasm of accommodation (near reflex spasm) | Variable myopia, miosis and esotropia episodes; often stress-related or functional | Cycloplegic refraction; reassurance; cycloplegic drops or plus lenses short term; consider functional overlay |
| Paralysis of accommodation | Sudden loss with a dilated pupil | Exclude drugs (anticholinergics), third nerve palsy, Adie pupil, trauma, diabetes |
Symptoms
Blur at near or when looking up from near, headaches or eye strain with reading, difficulty concentrating, words moving, avoiding reading, and symptoms worse later in the day. Use a symptom questionnaire (such as CISS) and ask specifically about screens and study time.
The essential tests
Amplitude (push-up or minus-lens method), monocular estimate method (MEM) retinoscopy for lag, accommodative facility with ±2.00 D flippers, negative and positive relative accommodation (NRA/PRA), and the near point of convergence. See accommodation testing for how to do each test and the normal values.
Vision therapy in practice
- Flipper (lens rock) training: alternate ±1.50 to ±2.00 D lenses while reading small print; increase speed and power as it improves.
- Hart chart (near-far rock): read letters alternately at near and distance charts.
- Push-up and minus-lens rock for insufficiency; plus-lens rock for excess.
- Combine with vergence therapy if convergence insufficiency is also present (often both co-exist). Office-based therapy with home reinforcement works best (CITT evidence for convergence insufficiency).
- Usually 8–12 weeks; review symptoms and repeat the measurements.
When to refer
Sudden or asymmetric loss of accommodation, accommodation loss with an abnormal pupil, headache with neurological symptoms, papilloedema, or reduced acuity that does not improve with lenses.
Practical pearls
- A 10-year-old with headaches at school and an amplitude of 6 D has accommodative insufficiency: Hofstetter minimum at 10 is 12.5 D.
- Pseudomyopia from accommodative excess is common in exam-season students: always confirm myopia with a cycloplegic refraction before the first minus prescription.
- Treat co-existing convergence insufficiency at the same time, or symptoms will persist.
Where students slip
- Prescribing minus lenses for accommodative spasm.
- Testing amplitude only once: ill-sustained accommodation shows only on repeated measurement.
- Missing a pupil abnormality in sudden accommodative paralysis.
Test yourself: flip cards
Quick quiz
Related: Accommodation Testing: Amplitude, MEM and Nott Retinoscopy, Facility, NRA and PRA, Convergence Insufficiency and Convergence Excess: Diagnosis, Treatment and Exercises, Orthoptic Tests Made Easy: Cover Test, Hess Chart, Synoptophore, Worth 4-Dot and Stereopsis, Refraction Calculators: Near Add, AC/A Ratio, Retinoscopy and Prism, Computer Vision Syndrome Ahmedabad. Back to the optometry curriculum.
Key sources
- Scheiman M, Wick B. Clinical Management of Binocular Vision. 5th ed. Wolters Kluwer; 2019
- Evans BJW. Pickwell's Binocular Vision Anomalies. 5th ed. Butterworth-Heinemann; 2007
- Convergence Insufficiency Treatment Trial Study Group. Arch Ophthalmol. 2008;126:1336-1349
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