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- optical low coherence reflectometer
- contact applanation A-scan ultrasound
- IOL calculation
- lens and zonules
- optics and refraction
A-scan ultrasound biometers enable measurements of axial length (AL), anterior chamber depth (ACD), lens thickness (LT) and usually also central corneal thickness (CCT). The new Haag-Streit Lenstar LS 900 measures all of the above parameters and additionally retinal thickness in the optical line utilising optical low coherence reflectometry (OLCR) technology in a non-contact fashion. Furthermore, the corneal radius in the steep and flat meridian can be determined.1 In a prospective, non-randomised study, we evaluated the reproducibility and correlation of biometry using the Lenstar LS 900 compared with contact A-scan ultrasound using the AL-3000 in 83 cataract eyes of 54 subjects (mean age 73.9 years, SD 11.2). Of these 83 eyes, 58 eyes were classified as having nuclear (NUC) cataract grade 1, 17 presented with grade 2, and eight cataracts were classified as grade 3. AL measurements were possible in 68 (82%) eyes with the Lenstar versus 82 (99%) eyes with the …
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