title: Simplified recording of soft contact lens fit.
abstract: OBJECTIVE
  To determine the critical fitting characteristics of modern soft contact lens fits and from this to devise a simplified recording scheme.
  
  
  METHODS
  Ten subjects (aged 28.1+/-7.4 years) wore eight different modern soft contact lenses. Video was captured and analysed of blink (central and up-gaze), excursion lag (up, down, right and left gaze) and push-up movement, centration and coverage.
  
  
  RESULTS
  Lens centration was on average close to the corneal centre. Movement on blink was significantly smaller in up-gaze than in primary-gaze (p<0.001). Lag was greatest in down-gaze and least in up-gaze (p<0.001). Push-up test recovery speed was 1.32+/-0.73 mm/s. Overall lens movement was determined best by assessing horizontal lag, movement on blink in up-gaze and push-up recovery speed. Steeper lens base-curves did not have a significant effect on lens fit characteristics. Contact lens material did influence lens fit characteristics, particularly silicone-hydrogels which generally had lower centration and a faster push-up speed of recovery than HEMA lenses (p<0.05).
  
  
  CONCLUSIONS
  Lag on vertical gaze, and movement on blink in primary gaze generally provide little extra information on overall lens movement compared to horizontal lag, movement on blink in up-gaze and push-up recovery speed. They can therefore be excluded from a simplified recording scheme. A simplified and comprehensive soft contact lens fit recording system could consist of a cross-hairs indicating the centre of the cornea; a circle to indicate the lens centration; a mark on the relevant position of the circle to indicate any limbal incursion; a grade (B) below for movement with blink in up-gaze, a grade (L) to the side for horizontal lag and a grade above (P) for the assessed push-up recovery speed.
authors.affiliation: Ophthalmic Research Group, Life and Health Sciences, Aston University, Aston Triangle, Birmingham, UK. j.s.w.wolffsohn@aston.ac.uk
authors.forename: James S
authors.initials: JS
authors.lastname: Wolffsohn
authors.forename: Olivia A
authors.initials: OA
authors.lastname: Hunt
authors.forename: Amritpreet K
authors.initials: AK
authors.lastname: Basra
mesh_terms: D000328:Adult; D003263:Contact Lenses, Hydrophilic / Q000706:statistics & numerical data*; D005069:Evaluation Studies as Topic; D005260:Female; D006801:Humans; D008297:Male; D017060:Patient Satisfaction; D011474:Prosthesis Design; D017755:Prosthesis Fitting / Q000706:statistics & numerical data*