title: Refractive outcomes comparison between the Lenstar LS 900® optical biometry and immersion A-scan ultrasound.
abstract: To determine the accuracy of intraocular lens (IOL) calculations in eyes undergoing phacoemulsification cataract surgery with IOL implantation using immersion A-scan ultrasound (US) and Lenstar LS 900(®) biometry. In this prospective study, 200 eyes of 200 patients were randomized to undergo either Lenstar LS 900(®) or immersion A-scan US biometry to determine the IOL dioptric power prior to phacoemulsification cataract surgery. Post-operative refractive outcomes of these two groups of patients were compared. The result showed no significant difference between the target spherical equivalent (SE) and the post-operative SE value by the Lenstar LS 900(®) (p value = 0.632) or immersion A-scan US biometry (p value = 0.438) devices. The magnitude of difference between the two biometric devices were not significantly different (p value = 0.868). There was no significant difference in the predicted post-operative refractive outcome between immersion A-scan US biometry and Lenstar LS 900(®). Based on the results, the immersion A-scan US technique is as accurate as Lenstar LS 900(®) in the hands of an experienced operator.
authors.affiliation: Department of Ophthalmology, University of Malaya, 59100, Kuala Lumpur, Malaysia, palanyraj_n@hotmail.com.
authors.forename: Palanyraj
authors.initials: P
authors.lastname: Naicker
authors.forename: Siva
authors.initials: S
authors.lastname: Sundralingam
authors.forename: Mohammadreza
authors.initials: M
authors.lastname: Peyman
authors.forename: Azida
authors.initials: A
authors.lastname: Juana
authors.forename: Nor Fadhilah
authors.initials: NF
authors.lastname: Mohamad
authors.forename: Maung Maung
authors.initials: MM
authors.lastname: Win
authors.forename: Angela
authors.initials: A
authors.lastname: Loo
authors.forename: Visvaraja
authors.initials: V
authors.lastname: Subrayan
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D001699:Biometry / Q000295:instrumentation / Q000379:methods*; D005123:Eye / Q000000981:diagnostic imaging*; D005260:Female; D006801:Humans; D019654:Lens Implantation, Intraocular; D007910:Lenses, Intraocular; D008297:Male; D008875:Middle Aged; D018918:Phacoemulsification / Q000379:methods*; D011446:Prospective Studies; D012029:Refraction, Ocular / Q000502:physiology*; D014463:Ultrasonography