title: A method for using relay lenses with display monitors for vision testing at far and near.
abstract: Resolution limitations preclude the use of display monitors for near testing of acuity and contrast sensitivity. Relay lenses can form minified aerial images of the display at any given near viewing distance, but the image will differ in spatial frequency from the display. Equations are presented that can be used to specify the far- and near-viewing distances and the necessary focal length of a lens so that the display and its near aerial image have identical spatial frequencies when viewed by a subject at a fixed location. Modulation transfer function (MTF) calculations show that achromatic doublets will not degrade the resolution across a 300-mm wide display, thereby providing the versatility of display monitors for near vision testing.
authors.affiliation: Department of Vision Sciences, SUNY College of Optometry, New York, New York 10010, USA. mkatz@sunyopt.edu
authors.forename: M
authors.initials: M
authors.lastname: Katz
mesh_terms: D016288:Computer Terminals; D005139:Eyeglasses; D006801:Humans; D006956:Hyperopia / Q000175:diagnosis*; D009216:Myopia / Q000175:diagnosis*; D012029:Refraction, Ocular; D015203:Reproducibility of Results; D014787:Vision Tests / Q000295:instrumentation*; D014792:Visual Acuity