Effect of nearwork-induced transient myopia on distance retinal defocus patterns

Two-dimensional, schematic representation of 2 far-viewing conditions with related DOF (heavy solid lines) and proximal equiblur planes (heavy dashed lines). Grey region represents clarity zone beyond infinity. A, Isolated stimulus far-viewing condition; B, Complex stimulus far-viewing condition. T = target. Figure not to scale.

Plot of hyperfocal clarity zones/planes without (A) and with (B) NITM at far/infinity (∞). C in free space represents the point conjugate with the retina (C¹). Small dotted lines represent the distal edge of the depth-of-focus, and the heavy dashed lines represent the proximal edge of the depth-of-focus. The thin solid line represents infinity (∞).

Schematic model represents the relative contribution of the center and near/far peripheral retinal defocus and its relation to NITM and the hyperfocal refraction. With either NITM added or with myopic undercorrection, the image plane is transiently displaced anteriorly, and the relative myopic defocus increases across the retinal extent. (These planes are depicted to be flatter than assumed for purposes of graphical clarity.)