title: Comparative evaluation of efficacy and safety of ophthalmic viscosurgical devices in phacoemulsification [ISRCTN34957881].
abstract: BACKGROUND
  Various ophthalmic viscosurgical devices (OVD) are used to perform phacoemulsification and other intraocular surgeries. We performed a study to compare the efficacy and safety of three ophthalmic viscosurgical devices that are routinely used in phacoemulsification.
  
  
  METHODS
  Fifty-six patients of immature senile cataract with hard nucleus (grade 3 and 4) who underwent phacoemulsification were included. Depending upon the type of OVD, patients were randomly allocated into three groups; group 1 (n = 19), Viscoat was used; group 2 (n = 19), Healon GV was used; group 3 (n = 18), Healon 5 was used. Parameters evaluated were uncorrected and best corrected visual acuity, specular microscopy, intraocular pressure and pachymetry both preoperatively and postoperatively on day 1, 1 week, 1 month and 3 months and development of any complication both intraoperative and postoperative were also noted.
  
  
  RESULTS
  The mean increase in central corneal thickness was 15.17% (group 1); 17.26% (group 2) and 16.21% (group 3) on first postoperative day and was comparable in the three groups. The density of endothelial cells decreased postoperatively (day 1) by 12.54% (group 1), 13.76% (group 2) and 13.06% (group 3) and was comparable. The mean preoperative intraocular pressure in groups 1, 2 and 3 were 13.3 +/- 2.0, 14.0 +/- 2.2 and 13.2 +/- 3.2 mmHg respectively, which changed to 16.0 +/- 4.7, 12.2 +/- 4.7 and 12.3 +/- 4.8 respectively on first postoperative day and the change in intraocular pressure was significantly higher in group 1 (1 vs 2 & 1 vs 3; p = 0.02; oneway ANOVA).
  
  
  CONCLUSIONS
  Viscoat, Healon GV and Healon 5 give comparable results in terms of efficacy and safety in performing phacoemulsification.
authors: Rajendra Prasad Centre for Ophthalmic Sciences, All India Institute of Medical Science, New Delhi, India. rasikvajpayee@rediffmail.com
authors: Rasik B
authors: RB
authors: Vajpayee
authors: Kamna
authors: K
authors: Verma
authors: Rajesh
authors: R
authors: Sinha
authors: Jeewan S
authors: JS
authors: Titiyal
authors: R M
authors: RM
authors: Pandey
authors: Namrata
authors: N
authors: Sharma
mesh_terms: D000180:Acrylic Resins; D000368:Aged; D002452:Cell Count; D002807:Chondroitin / Q000009:adverse effects / Q000627:therapeutic use*; D002809:Chondroitin Sulfates; D004338:Drug Combinations; D004728:Endothelium, Corneal / Q000473:pathology; D006801:Humans; D006820:Hyaluronic Acid / Q000009:adverse effects / Q000627:therapeutic use*; D019654:Lens Implantation, Intraocular; D007910:Lenses, Intraocular; D018918:Phacoemulsification; D016896:Treatment Outcome; D014792:Visual Acuity
chemical_list: D000180:Acrylic Resins; D004338:Drug Combinations; C501944:chondroitin sulfate, sodium hyaluronate drug combination; D006820:Hyaluronic Acid; D002807:Chondroitin; D002809:Chondroitin Sulfates