title: Boston ocular surface prosthesis: an Indian experience.
abstract: BACKGROUND
  Boston ocular surface prosthesis (BOSP) is a scleral contact lens used in the management of patients who are rigid gas permeable (RGP) failures as with corneal ectasias such as keratoconus and in those patients who have ocular surface disease such as Stevens-Johnson syndrome (SJS).
  
  
  OBJECTIVE
  To report utilization of BOSP in a tertiary eye care center in India.
  
  
  METHODS
  We retrospectively reviewed charts of 32 patients who received BOSP from July 2008 to May 2009. Indications for fitting these lenses, improvement in visual acuity (VA) before and after lens fitting and relief of symptoms of pain and photophobia were noted. Paired t-test was used for statistical analysis using SPSS version 16.0 for Windows.
  
  
  RESULTS
  Thirty-two patients (43 eyes) received these lenses. These consisted of 23 eyes of 17 patients who failed RGP trials for irregular astigmatism and corneal ectasia such as keratoconus and post radial keratotomy and scar and 20 eyes of 15 patients with SJS. Mean age of RGP failures was 27.94 years. Pre- and post-BOSP wear mean LogMAR VA was 1.13 and 0.29, respectively, in RGP failures. The P value was statistically significant (P < 0.001). In patients with SJS, LogMAR VA was 0.84 ± 0.92 before and 0.56 ± 0.89 after lens wear. The P value was statistically significant (P < 0.001). VA improved by >2 lines in 7/20 eyes (35%) with SJS, with improvement in symptoms.
  
  
  CONCLUSIONS
  BOSP improves VA in patients who have irregular astigmatism as in ectasias and RGP failures and improves vision and symptoms in patients with SJS.
authors.affiliation: Cornea and Anterior Segment Services, LV Prasad Eye Institute, Hyderabad, India. varsharathi@lvpei.org
authors.forename: Varsha Madanlal
authors.initials: VM
authors.lastname: Rathi
authors.forename: Preeji Sudharman
authors.initials: PS
authors.lastname: Mandathara
authors.forename: Srikanth
authors.initials: S
authors.lastname: Dumpati
authors.forename: Pravin K
authors.initials: PK
authors.lastname: Vaddavalli
authors.forename: Virender S
authors.initials: VS
authors.lastname: Sangwan
mesh_terms: D000293:Adolescent; D000328:Adult; D001251:Astigmatism / Q000503:physiopathology / Q000534:rehabilitation*; D002648:Child; D003261:Contact Lenses / Q000706:statistics & numerical data*; D005128:Eye Diseases / Q000209:etiology / Q000503:physiopathology / Q000534:rehabilitation; D006801:Humans; D007194:India; D007640:Keratoconus / Q000503:physiopathology / Q000534:rehabilitation*; D008875:Middle Aged; D012189:Retrospective Studies; D012590:Sclera; D013262:Stevens-Johnson Syndrome / Q000150:complications; D014785:Vision, Ocular; D014792:Visual Acuity; D055815:Young Adult