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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]
Ophthalmology. Symptoms. asthenopia, blurring of vision. In ophthalmology, accommodative excess (also known as excessive accommodation or accommodation excess) occurs when an individual uses more than normal accommodation (focusing on close objects) for performing certain near work.
Accommodative insufficiency. Accommodative insufficiency is the condition where amplitude of accommodation of a person is lesser compared to physiological limits for their age. Premature sclerosis of lens or ciliary muscle weaknesses due to systemic or local cases may cause accommodative insufficiency.
A spasm of accommodation (also known as a ciliary spasm, an accommodation, or accommodative spasm) is a condition in which the ciliary muscle of the eye remains in a constant state of contraction. Normal accommodation allows the eye to "accommodate" for near-vision.
Accommodative infacility also known as accommodative inertia is the inability to change the accommodation of the eye with enough speed and accuracy to achieve normal function. This can result in visual fatigue, headaches, and difficulty reading.
Accommodative dysfunction, binocular dysfunction, amblyopia, strabismus: Causes: Axial length of eyeball is too short, lens or cornea is flatter than normal, aphakia: Risk factors: Ageing, hereditary: Diagnostic method: Eye exam: Differential diagnosis: Amblyopia, retrobulbar optic neuropathy, retinitis pigmentosa sine pigmento: Treatment
Accommodative vergence is measured as the ratio between how much convergence takes place for a given accommodation (AC/A ratio, CA/C ratio). Proximal vergence is sometimes also called voluntary vergence, which however more generally means vergence under voluntary control and is sometimes considered a fifth type of vergence.
Presbyopia is physiological insufficiency of accommodation associated with the aging of the eye that results in progressively worsening ability to focus clearly on close objects. Also known as age-related farsightedness (or age-related long sight in the UK), it affects many adults over the age of 40. A common sign of presbyopia is difficulty ...
Accommodative convergence is that portion of the range of inward rotation of both eyes (i.e., convergence) that occurs in response to an increase in optical power for focusing by the crystalline lens (i.e., accommodation).
Presbyopia due to physiological insufficiency of accommodation (accommodation tends to decrease with age) is the main cause of defective near vision in the elderly. Other causes of defective near vision include accommodative insufficiency, paralysis of accommodation etc.