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New biometry device accurate for small intraocular measurements

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PARIS — A novel biometry device is showing efficacy for determining the size of even small intraocular distances within the anterior chamber in both phakic and pseudophakic eyes, according to a speaker here.

Wolfgang Haigis, MD, presented the 12-month results of a study evaluating the new ACMaster from Carl Zeiss Meditec here at the European Society of Cataract and Refractive Surgeons meeting.

The ACMaster uses partial coherence interferometry to make segmental measurements of the anterior chamber, cornea and lens along the eye’s optical axis, according to Dr. Haigis.

Phakic and pseudophakic patients, as well as patients implanted with phakic IOLs, were included in the study. Unlike ultrasound devices, the ACMaster was able to image the central thickness of the stroma and PMMA IOLs with a high degree of precision, Dr. Haigis said. The retrolenticular space in pseudophakic eyes could also be measured, he noted.

Mean reproducibility was within 1.9 µm for measurements of corneal thickness, 4.8 µm for anterior chamber depth, and 2.5 µm for the position of the posterior lens vertex, Dr. Haigis said.