title: Fresnel prism use among orthoptists.
abstract: OBJECTIVE
  To better understand current uses of Fresnel prisms.
  
  
  METHODS
  A seventeen-question survey was completed by members of the American Association of Certified Orthoptists (AACO).
  
  
  RESULTS
  Surveys were emailed to 211 orthoptists with a 36% response rate (n = 76). Prisms are used preoperatively to determine the surgical angle for 72% of respondents, 94% use prisms for postoperative misalignment. Prisms are used for incomitant deviations by up to 96% of respondents. The greatest patient objection to Fresnel use is reduced vision and distortion, not diplopia out of primary position. Of orthoptists surveyed, 99% use Fresnel prisms for near-distance disparity, 36% splitting prisms for upper and lower segments, and 40% encourage separate spectacles for near and distance. When deciding to grind prism, 66% wait more than one month. Ninety-nine percent of orthoptists use Fresnel prisms with adults, 67% use them with children. When correcting vertical and horizontal deviations, 70% of orthoptists rotate a prism over one lens.
  
  
  CONCLUSIONS
  Fresnel prisms have a wide use among North American certified orthoptists, including use with pediatric patients. Incomitance is not a contraindication to Fresnel use. Orthoptists prefer rotating one prism to bilateral Fresnel prisms.
authors.forename: Terra
authors.initials: T
authors.lastname: Haller
authors.forename: Bruce A
authors.initials: BA
authors.lastname: Furr
mesh_terms: D000328:Adult; D002648:Child; D004172:Diplopia / Q000628:therapy*; D019538:Health Care Surveys; D006801:Humans; D055096:Optical Devices / Q000706:statistics & numerical data*; D009988:Orthoptics / Q000295:instrumentation* / Q000706:statistics & numerical data*; D013285:Strabismus / Q000628:therapy*
keywords: Fresnel prism; diplopia; orthoptist; strabismus