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. Author manuscript; available in PMC: 2014 Jul 1.
Published in final edited form as: Ophthalmic Physiol Opt. 2013 Jul;33(4):497–507. doi: 10.1111/opo.12075

Figure 1.

Figure 1

Classic accommodative response curve in which accommodative response (refractive state of relaxed eye – refractive state of accommodated eye) in dioptres is plotted as a function of accommodative demand (refractive state of relaxed eye – target vergence) in dioptres. For this example an accommodative demand of 4D elicits an accommodative response of 3D, indicating a lag (demand-response) of 1 D. Although this eye has the ability to accommodate 4D (small circle), lag persists even though improved focusing would improve retinal image quality by reducing defocus blur.