• By: Kurt Simons, PhD
    Vision Screening

    Introduction

    Definitions

    Photoscreener: An instrument that utilizes optical images of the eye's red reflex to estimate refractive error, ocular alignment and other conditions degrading or blocking line of sight such as media opacities, ptosis, and hemangioma. Photoscreener summaries and reviews are available from EyeWiki.

    Autorefractor: An instrument that utilizes automated optical methods to determine the refractive error of an eye, with the goal in vision screening of detecting errors likely to cause strabismus and/or amblyopia. Other conditions degrading or distorting the unit's imaging pathway, such as media opacities, may also cause a screening failure.

    History: Howland HC. Photorefraction of eyes: history and future prospects. Optom Vis Sci. 2009 Jun;86(6):603-6.