title: [Virus relevant physicochemical parameters of viscoelastics in cataract operation].
abstract: OBJECTIVE
  To define the physicochemical parameters of viscoelastics that are most important for visual acuity after phacoemulsification.
  
  
  METHODS
  Eleven commercially available viscoelastics (ophthalmic viscosurgical device, OVD) were used in consecutive cataract operations. In addition to clinical findings, we assessed visual acuity, intraocular pressure, endothelial cell density, and pachymetric data preoperatively and on the first postoperative day.
  
  
  RESULTS
  On the first postoperative day the loss of endothelial cells in all phacoemulsifications was 0.661%, corrected for 1 s phacotime, while corneal thickness increased by 0.2384% and visual acuity by 5.206%, and intraocular pressure decreased by 0.306%. The most important parameters for visual acuity were the concentration of sodium hyaluronate and viscosity (100/s.) of the OVD. Pachymetric data were more relevant for postoperative visual acuity than endothelial cell counts.
  
  
  CONCLUSIONS
  Early visual rehabilitation after phacoemulsification depends on stable pachymetric data. OVD with a high content of sodium hyaluronate and high viscosity significantly reduces corneal swelling and improves visual acuity after phacoemulsifications on the first postoperative day.
authors.affiliation: Augenklinik im Städtischen Klinikum Braunschweig.
authors.forename: U
authors.initials: U
authors.lastname: Weber
authors.forename: N
authors.initials: N
authors.lastname: Holak
mesh_terms: D003315:Cornea / Q000187:drug effects / Q000473:pathology; D004728:Endothelium, Corneal / Q000187:drug effects / Q000473:pathology; D006801:Humans; D006820:Hyaluronic Acid / Q000008:administration & dosage / Q000009:adverse effects*; D007910:Lenses, Intraocular; D018918:Phacoemulsification; D011183:Postoperative Complications / Q000175:diagnosis* / Q000503:physiopathology; D011446:Prospective Studies; D016037:Single-Blind Method; D014783:Viscosity; D014792:Visual Acuity / Q000187:drug effects*
chemical_list: D006820:Hyaluronic Acid