title: Visual performance after interface haemorrhage during laser in situ keratomileusis.
abstract: OBJECTIVE
  To study the visual performance in eyes with interface haemorrhage during laser assisted in situ keratomileusis (LASIK).
  
  
  METHODS
  Case records of 20 patients, who had bleeding from the limbal vessels in one eye during LASIK (group 1) and uncomplicated surgery in the fellow eye (group 2) were studied. The parameters evaluated were uncorrected visual acuity (UCVA) best corrected visual acuity (BCVA), spherical equivalent of refraction (SEQ), contrast sensitivity, and glare acuity preoperatively and at 1, 3, and 6 months postoperatively.
  
  
  RESULTS
  The mean preoperative SEQ in group 1 and 2 eyes was -5.79 (2.3) D and -5.27 (1.68) D, respectively. The mean decimal UCVA at 6 months after LASIK in group 1 and 2 eyes were 0.6 (0.2) and 1.0 respectively (p<0.001). The mean decimal BCVA at 1 week after LASIK in group 1 and 2 eyes were 0.89 (0.04) and 1.0 respectively (p<0.05). However, all eyes had a BCVA of 6/6 at 1, 3, and 6 months after LASIK. The mean contrast sensitivity values preoperatively in group 1 and 2 eyes were 161.3 (8.7) and 172 (68.2) respectively. There was a significant decrease in group 1 at 6 months (102 (60.5) (p<0.01)) compared to group 2. The decimal glare acuity preoperatively in group 1 and 2 eyes was 0.95 (0.11) and 0.89 (0.12), respectively. It decreased significantly in group 1 (0.7) (0.1 (p<0.01)) compared to group 2 at the 6 month follow up.
  
  
  CONCLUSIONS
  Occurrence of intraoperative interface haemorrhage may affect the visual performance following LASIK surgery.
authors.affiliation: Rajendra Prasad Centre for Ophthalmic Sciences, All India Institute of Medical Sciences, New Delhi, India. rasikvajpayee@rediffmail.com
authors.forename: R B
authors.initials: RB
authors.lastname: Vajpayee
authors.forename: R
authors.initials: R
authors.lastname: Balasubramanya
authors.forename: A
authors.initials: A
authors.lastname: Rani
authors.forename: N
authors.initials: N
authors.lastname: Sharma
authors.forename: J S
authors.initials: JS
authors.lastname: Titiyal
authors.forename: R M
authors.initials: RM
authors.lastname: Pandey
mesh_terms: D000293:Adolescent; D000328:Adult; D016063:Blood Loss, Surgical / Q000503:physiopathology*; D015350:Contrast Sensitivity; D005130:Eye Hemorrhage / Q000209:etiology / Q000503:physiopathology*; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D020731:Keratomileusis, Laser In Situ / Q000009:adverse effects*; D008297:Male; D009216:Myopia / Q000601:surgery*; D012030:Refractive Errors / Q000209:etiology / Q000503:physiopathology; D014786:Vision Disorders / Q000209:etiology* / Q000503:physiopathology; D014792:Visual Acuity