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So, if the near point of an emmetrope is at 25 cm from the spectacle plane, the amplitude of accommodation is equal to − [−1/(25 ✕ 10)] = 4 D.
The amplitude of accommodation declines from about 14 D at age 10 to about 0.5 D at age 60 (although the measured value is usually higher due to the depth of focus of the eye).
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It is expressed in dioptres, as the difference between the far point and the near point measured with respect either to the spectacle plane or the corneal apex or some other reference point.
Thus,where B is the near point vergence and K is the far point vergence. In the emmetropic eye, A = −B, because the far point is at infinity and K = 0.
The ciliary muscle is controlled by the parasympathetic system, which is triggered by an out of focus retinal image. See push-up method; near point rule; near point sphere; Scheiner's test.negative accommodation 1.
See convergence accommodation; proximal accommodation; accommodative response; ciliary muscle; near reflex.meridional accommodation See astigmatic accommodation.microfluctuations of accommodation Involuntary variations in the contraction of the intraocular muscles responsible for accommodation and resulting in changes of about 0.1-0.5 D with a frequency of 0.5-2.5 point of accommodation The nearest point in space that is conjugate with the foveola when exerting the maximum accommodative effort. A relaxation of accommodation below the apparent zero level or when shifting from near to distance vision. See relative amplitude of accommodation.objective accommodation Accommodation measured without the subject's judgment.
See convergence accommodation; proximal accommodation; reflex accommodation; resting state of accommodation.consensual accommodation Accommodation occurring in one eye when the other eye has received the dioptric stimulus.convergence accommodation 1.