The Ophthalmology
Survival Guide
Accommodation
Accommodation increases the optical or focal power of the eye through ciliary body contraction. This reduces the tension on the lens zonules, causing the lens to assume a more convex contour, thereby increasing its refractive power.
Survival Tips!
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Accommodation is an active mechanism. It requires effort, and one’s ability to use it tends to wane, predictably, with age due to many factors. The decline in our ability to accommodate with age is known as presbyopia.
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Accommodation is also reflexively linked to pupillary constriction and convergence of the eyes. This combination is sometimes referred to as the near triad (i.e. accommodation, pupillary constriction, convergence).
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The proper ratio of accommodative convergence to accommodation (i.e. the AC:A ratio) is important.