title: The in vitro study of pressure change effect on corneal birefringence.
abstract: OBJECTIVE
  To study the change of corneal birefringence at different pressures in vitro to determine whether corneal birefringence changes along with pressure.
  
  
  METHODS
  The pattern of corneal birefringence was recorded at different intraocular pressures. The pressure differences were 0.10, 0.50 and 1.00 mm Hg, respectively. To compare the pattern sequence at two pressure values, a nonpaired t test was performed.
  
  
  RESULTS
  Statistical analysis indicates that the difference of the corneal birefringence is significant when the pressure difference was more than 0.50 mm Hg in polarized light.
  
  
  CONCLUSIONS
  The results of corneal photoelasticity in vitro demonstrate that the change in pressure on the cornea leads to a change in corneal birefringence.
authors.affiliation: The Peking University Third Hospital, Peking University Eye Center, Beijing, China.
authors.forename: Zhen
authors.initials: Z
authors.lastname: Xiao
authors.forename: Chong
authors.initials: C
authors.lastname: Wang
authors.forename: Yan-Sheng
authors.initials: YS
authors.lastname: Hao
mesh_terms: D000818:Animals; D001718:Birefringence; D003315:Cornea / Q000502:physiology*; D008027:Light; D011312:Pressure; D012029:Refraction, Ocular / Q000502:physiology*; D013552:Swine