vision defect in a sentence

Examples

1. :: Note that that'focus'control pictured is a diopter adjustment that allows the user to compensate for his own vision defects and obtain a sharp view of the targeting reticle; it has nothing to do with focusing on targets at different distances . ( The system is fixed focus at infinity, and the reticle is in one of the image planes . ) talk ) 22 : 20, 6 March 2011 ( UTC)