title: Optical biometry in combined phacovitrectomy.
abstract: OBJECTIVE
  To assess the accuracy of intraocular lens (IOL) power calculation using optical biometry in patients having combined phacovitrectomy for macular hole and macular pucker.
  
  
  METHODS
  Sunderland Eye Infirmary, North East England, United Kingdom.
  
  
  METHODS
  This single-surgeon retrospective case series review comprised eyes having combined narrow-gauge phacovitrectomy for macular hole or macular pucker. Intraocular lens power was calculated using the results of optical biometry and the Haigis formula. Achieved and planned refraction were compared to calculate the mean postoperative refractive prediction error (ME) and the mean absolute postoperative prediction error (MAE) and the percentage of eyes with an achieved refraction within +/-0.50 diopter (D) and +/-1.00 D of the planned refraction. The results were compared with those in a series of 42 eyes that had phacoemulsification after previous vitrectomy surgery and a series of 60 nonvitrectomized eyes that had uneventful phacoemulsification.
  
  
  RESULTS
  Of the of 59 having combined phacovitrectomy, 39 had macular hole and 20 had macular pucker. There was no statistically significant difference in refractive outcomes between the phacovitrectomy group (ME -0.02, MAE 0.39) and the sequential phacoemulsification group (ME -0.10, MAE 0.38) (P = .82). There was a statistically significant difference between the phacovitrectomy group and the phacoemulsification-only group (ME 0.08, MAE 0.26) (P<.001).
  
  
  CONCLUSIONS
  The use of optical noncontact biometry with the Haigis formula achieved a high degree of accuracy of IOL power estimation in patients having phacovitrectomy. There was no tendency toward a myopic shift, as has been reported using ultrasound axial length measurement.
authors.affiliation: Sunderland Eye Infirmary, Sunderland, United Kingdom. sridharrm@hotmail.com
authors.forename: Sridhar R
authors.initials: SR
authors.lastname: Manvikar
authors.forename: David
authors.initials: D
authors.lastname: Allen
authors.forename: David H W
authors.initials: DH
authors.lastname: Steel
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001699:Biometry; D005260:Female; D006801:Humans; D019654:Lens Implantation, Intraocular; D007910:Lenses, Intraocular; D008297:Male; D008875:Middle Aged; D055620:Optical Phenomena; D018918:Phacoemulsification; D012029:Refraction, Ocular; D012167:Retinal Perforations / Q000601:surgery; D012189:Retrospective Studies; D014821:Vitrectomy