 | This article needs more reliable medical references for verification or relies too heavily on primary sources. (April 2019) |  |
| Accommodative insufficiency | |
|---|---|
| Differential diagnosis | Convergence insufficiency. |
Accommodative insufficiency (AI) involves the inability of the eye to focus properly on an object. Accommodation is the adjustment of the curvature of the lens to focus on objects near and far.
In this condition, amplitude of accommodation of a person is lesser compared to physiological limits for his age.[1] AI is generally considered separate from presbyopia, but mechanically both conditions represent a difficulty engaging the near vision system (accommodation) to see near objects clearly. Presbyopia is physiological insufficiency of accommodation due to age related changes in lens (decreased elasticity and increased hardness) and ciliary muscle power.[1]
AI is commonly present in people with convergence insufficiency.[2]
- ^ a b Khurana, AK (September 2008). "Asthenopia, anomalies of accommodation and convergence". Theory and practice of optics and refraction (2nd ed.). Elsevier. pp. 100–107. ISBN 978-81-312-1132-8.
- ^ Synopsis of Clinical Ophthalmology (3 ed.). Elsevier. 2013. pp. 321–333.