title: Viscocanalostomy versus trabeculotomy ab externo in primary congenital glaucoma: 1-year follow-up of a prospective controlled pilot study.
abstract: OBJECTIVE
  To study the effectiveness of viscocanalostomy in patients with primary congenital glaucoma of the isolated trabecular dysgenesis category and compare it with trabeculotomy ab externo.
  
  
  METHODS
  Eight patients with bilateral primary congenital glaucoma were enrolled in the study. After establishing the diagnosis, the more severely affected eye was randomly selected to undergo either trabeculotomy ab externo or viscocanalostomy, whereas the second eye underwent the other surgery 2 weeks after the first. The patients were examined on day 1, week 1, week 4 and thereafter every 4 weeks. Intraocular pressure (IOP) and corneal diameter measurements were obtained at week 1, month 6 and at the last reported follow-up. The paired-sample's Student's t test was applied for statistical analysis.
  
  
  RESULTS
  The mean (standard deviation (SD)) follow-up period was 12.5 (1.86) months. Preoperative IOP of eyes undergoing trabeculotomy (34.0 (2.6) mm Hg) and that of eyes undergoing viscocanalostomy (32.3 (4.1) mm Hg) showed no significant difference (p>0.1). A drop in IOP was noted in both groups at week 1, month 6 and at the last follow-up visit (p<0.001). Similarly, a decrease in the postoperative vertical and horizontal corneal diameters was noted in the two study groups.
  
  
  CONCLUSIONS
  Viscocanalostomy proved to be as effective as trabeculotomy ab externo in lowering IOP. Moreover, it is likely to be a good surgical alternative with a higher long-term success rate in eyes with more aggressive disease.
authors.affiliation: Department of Ophthalmology, American University of Beirut, Riad El Solh, Beirut, Lebanon. bndean@aub.edu.lb
authors.forename: B N
authors.initials: BN
authors.lastname: Noureddin
authors.forename: C P
authors.initials: CP
authors.lastname: El-Haibi
authors.forename: A
authors.initials: A
authors.lastname: Cheikha
authors.forename: Z F
authors.initials: ZF
authors.lastname: Bashshur
mesh_terms: D003315:Cornea / Q000473:pathology; D004812:Epidemiologic Methods; D005260:Female; D018463:Filtering Surgery / Q000009:adverse effects / Q000379:methods*; D005901:Glaucoma / Q000151:congenital* / Q000503:physiopathology / Q000601:surgery*; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D007429:Intraocular Pressure; D008297:Male; D014130:Trabeculectomy / Q000009:adverse effects / Q000379:methods; D016896:Treatment Outcome