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Optical biometry system fails in some cataract cases, according to study

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The Zeiss IOLMaster optical biometry system fails to reach axial length measurements in approximately 20% of United Kingdom public hospital cataract patients, according to a study.

Konrad Pesudovs, PhD, and a colleague looked at the rate of measurement acquisition failure and how it varied with morphology and severity in a study published in Acta Ophthalmologica Scandinavica.

They found that the failure was due mainly to posterior subcapsular cataracts (PSC), where the Lens Opacities Classification System III (LOCS III) score of p = 3.5 defines the limit of PSC severity that the IOLMaster can measure.

Cataracts caused measurement acquisition failure in 22 cases, including all mature cataracts and PSC with LOCS III, according to the study.

The study examined 149 subjects and measured them for visual acuity, LOCS III scores, ultrasonic A-scan and IOLMaster axial lengths.