Comparing Biometric Devices for Similarity of IOL Power Measurements
Narrative Responses:
Purpose
To evaluate the accuracy of intraocular lens power calculations using Lenstar (an optical low-coherence reflectometry biometer) as compared to the gold standard IOLMaster.
Methods
It was a retrospective study. In patients scheduled for cataract surgery, biometry measurements were performed by trained examiners on 12 eyes of 6 cataract patients with Lenstar and IOLMaster. Axial length (AL), corneal keratometry readings (K1, K2), anterior chamber depth (ACD), and white to white measurements were obtained. Intraocular lens power was calculated using the Holladay 2 formula and measurements from both biometers for a SN60WF lens. The goal was emmetropia.
Results
Axial length was 23.82 mm with Lenstar and 23.93 mm with IOLMaster. K1 was 43.70 D by Lenstar and 43.71 D by IOLMaster. K2 was 45.56 D and 45.62 D with Lenstar and IOLMaster respectively. ACD was 3.18 mm and 3.19 mm respectively by Lenstar and IOLMaster. The white to white measurement was 11.86 mm with Lenstar and 11.86 mm with IOLMaster. There was no statistically significant difference between the two readings for any of these measurements (P>.05). IOL power calculations using the Holladay 2 formula with biometry values from Lenstar and IOLMaster showed good agreement.
Conclusion
Lenstar can provide noncontact biometry measurements as accurate as IOLMaster, which should make it a viable alternative to IOLMaster for IOL power calculations. Lenstar can be used for the preoperative examination of cataract patients.