What is the term used for the ability to change the focusing power of the eye from far to near?
Ophthalmic Patient Services and Education
No
U
C
The answer is C. The ability to change focus from distance to near is called accommodation. Accommodation is accomplished by the contraction and relaxation of the ciliary muscle of the eye. When the ciliary muscle contracts, then the attached lens zonules relax allowing the crystalline lens to "fatten" and thus be able to focus on more near objects. Conversely, when the ciliary muscle relaxes, the lens zonules tighten which causes the lens to become "skinnier" and thus be able to focus on objects at a distance.
All humans will begin to lose some of their ability to accommodate around the age of 40-45 years old. This progressive loss of accommodation is called presbyopia and is why many individuals start wearing reading glasses around this age.
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