Fatigue reduces tonic accommodation

Ocular accommodation adopts a mean baseline response level of approximately 1.0 D in the absence of blur feedback (open‐loop state). This baseline or tonic accommodation (TA) can be elevated following a sustained monocular accommodative response to a dioptric stimulus (lens adaptation) that exceeds the baseline open‐loop level of TA. The accommodative response to the lens persists in the open‐loop state (accommodative hysteresis), and eventually decays to a stable end‐point. Interestingly, if the baseline TA is high, the monocularly adapted accommodative state can decay to an end‐point that is below the initial pre‐adapted baseline level of the TA (counter‐adaptive response) (McBrien, N.A. and Millodot, M., (1988). Differences in adaptation of TA with refractive state. Invest. Ophthalmol. Vis. Sci., 29, 460–469).

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