title: The effect of the YK lens in keratoconus.
abstract: OBJECTIVE
  To report the clinical results of the use of the YK contact lens (Lucid Co., Seoul, Korea) for keratoconus.
  
  
  METHODS
  One hundred and twenty nine keratoconic eyes were fitted with a YK lens which has one base curve and three peripheral curves. A light feather touch fluorescein pattern was obtained based on topographic indices. Visual acuity, comfort, mean wearing time, and ocular tissue changes were evaluated. Mean follow up was 17.5 +/- 13.8 months (range 6-75).
  
  
  RESULTS
  One hundred and twenty six (97.6%) eyes tolerated the contact lenses. A total of 94.5% of the eyes achieved a visual acuity of 20/40 or better (average 0.79 +/- 0.21), and flatter base curve radius (BCR) was related to better visual acuity. One hundred and seventeen (90.7%) eyes reported that the lenses were comfortable. Mean wearing time was 12.1 h per day (range 4-18). Changes in keratometric values were not significant between baseline and final follow-up visit.
  
  
  CONCLUSIONS
  The YK lens can provide successful visual outcome, with comfort, and no significant influence on the progression of keratoconus.
authors.affiliation: Noblesse Plastic Surgery Clinic, Pusan, Korea.
authors.forename: Young Seok
authors.initials: YS
authors.lastname: Kang
authors.forename: Young Kee
authors.initials: YK
authors.lastname: Park
authors.forename: Jong Soo
authors.initials: JS
authors.lastname: Lee
authors.forename: Seung Uk
authors.initials: SU
authors.lastname: Lee
authors.forename: Jong Hun
authors.initials: JH
authors.lastname: Shin
authors.forename: Young Sang
authors.initials: YS
authors.lastname: Han
authors.forename: Dong Jun
authors.initials: DJ
authors.lastname: Lee
authors.forename: Hee Young
authors.initials: HY
authors.lastname: Choi
authors.forename: Boo Sup
authors.initials: BS
authors.lastname: Oum
authors.forename: Ji-Eun
authors.initials: JE
authors.lastname: Lee
mesh_terms: D000293:Adolescent; D000328:Adult; D003261:Contact Lenses; D003315:Cornea / Q000503:physiopathology; D019781:Corneal Topography; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007640:Keratoconus / Q000503:physiopathology / Q000628:therapy*; D008297:Male; D008875:Middle Aged; D017060:Patient Satisfaction; D017755:Prosthesis Fitting; D013997:Time Factors; D014792:Visual Acuity / Q000502:physiology; D055815:Young Adult