title: [Quantitative assess the efficacy of congenital idiopathic nystagmus surgery by digital eye tracker].
abstract: OBJECTIVE
  To evaluate the feasibility of independently developed digital eye tracker in determining the efficacy of congenital idiopathic nystagmus (CIN) surgery.
  
  
  METHODS
  Aprospective selfpairing study. The surgical efficacy was evaluated by independently developed eye tracker in 16 CIN patients. The null zone and the frequency, amplitude, intensity of nystagmus in various gazing position were recorded with eye tracker pre and post operatively. The consistency of null zone determined by digital eye tracker and clinical investigation were evaluated. The preoperative and postoperative rectification of horizontal and vertical nystagmus in the horizontal direction of individual patient were compared by paired samples t-test. The improvement or aggravation quantity were recorded by comparing preoperative and postoperative intensity of nystagmus every 5° within 25°.
  
  
  RESULTS
  The null zone got from digital eye tracker and clinical investigation were highly consistent (r = 0.952, P < 0.01). The horizontal and vertical intensity improved in 9 patients (t = 2.335-6.609, P < 0.05) and 5 patients (t = 2.176-5.471, P < 0.05) respectively after surgery. There were 67.63% (117/173) horizontal intensity and 69.94% (121/173) vertical intensity improvement.
  
  
  CONCLUSIONS
  The independently developed digital eye tracker can quantitatively evaluate the pre and post-operative nystagmus and analyze the surgical efficacy for CIN patients.
authors: The Southwest ophthalmic Hospital, Southwest Hospital of the Third Military Medical University, Chongqing 400038, China.
authors: Hong
authors: H
authors: Yang
authors: Tao
authors: T
authors: Yu
authors: Junping
authors: J
authors: Yao
authors: Zheng
authors: Z
authors: Tai
authors: Min
authors: M
authors: Wang
authors: Email: yzhengqin@163.com.
authors: Zhengqin
authors: Z
authors: Yin
mesh_terms: D053483:Eye Movement Measurements; D005240:Feasibility Studies; D006801:Humans; D020417:Nystagmus, Congenital / Q000503:physiopathology* / Q000601:surgery*; D009801:Oculomotor Muscles; D011184:Postoperative Period; D011446:Prospective Studies; D016896:Treatment Outcome