title: [Comparison of Lenstar and IOLMaster for intraocular lens power calculation].
abstract: OBJECTIVE
  To evaluate the precision of Intraocular Lens (IOL) power calculation using a new optical low-coherence reflectometry biometer (Lenstar) and compare the results with those obtained with IOLMaster.
  
  
  METHODS
  It was a prospective controlled study. Biometry measurements in 157 eyes of 98 cataract patients were performed by the same examiner with Lenstar and IOLMaster. Axial length (AL), corneal keratometry readings (Km), and anterior chamber depth (ACD) were obtained. Correlation and differences of biometry measurements obtained with two biometers were made. Intraocular Lens power were calculated using 4 formulas and the corresponding IOL constants, the target was emmetropia. Then statistical analysis was proceeded.
  
  
  RESULTS
  Axial length were (23.65 ± 1.17) mm and (23.65 ± 1.16) mm respectively, Km (44.15 ± 1.58) D and (44.17 ± 1.58) D respectively by Lenstar and IOLMaster and no statistical differences were found (P > 0.05). ACD were (3.09 ± 0.41) mm and (3.05 ± 0.41) mm respectively by Lenstar and IOLMaster and there was statistical difference between them (P = 0.001). All biometry measurements showed good linear correlation (r > 0.9, P < 0.001). IOL power calculations with biometry values between Lenstar and IOLMaster using the 4 formulas showed good agreement. The least difference was obtained with formula SRK/T and the most with formula Haigis.
  
  
  CONCLUSIONS
  Lenstar can provide precise and noncontact biometry measurements easily and safely, which are welcome by patients. Providing precise and reliable biometry measurements of cataract patients for Intraocular Lens power calculation, it shows good agreement with IOLMaster and the two biometers can be interchanged.
authors.affiliation: School of Ophthalmology & Optometry of Wenzhou Medical College, Wenzhou 325027, China.
authors.forename: Jin-hai
authors.initials: JH
authors.lastname: Huang
authors.forename: Xin
authors.initials: X
authors.lastname: Yang
authors.forename: Qin-mei
authors.initials: QM
authors.lastname: Wang
authors.forename: Shi-ming
authors.initials: SM
authors.lastname: Cheng
authors.forename: Jie
authors.initials: J
authors.lastname: Chen
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D000867:Anterior Chamber; D001699:Biometry; D002386:Cataract / Q000000981:diagnostic imaging* / Q000503:physiopathology*; D005260:Female; D006801:Humans; D007910:Lenses, Intraocular; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D011859:Radiography; D041623:Tomography, Optical Coherence; D014787:Vision Tests