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Anterior segment OCT accurately measures lens thickness in clear or opacified lenses
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Anterior segment optical coherence tomography proved accurate and predictable in measuring lens thickness in most eyes with clear or opacified lenses.
A-scan ultrasonography and Scheimpflug imaging are the most commonly used methods for measuring lens thickness in vivo.
"This newly available anterior segment technique offers a new noncontact method for the quantification of [lens thickness] that may help research on myopia and angle closure," the study authors said.
The study included 66 phakic eyes of 48 elderly patients who had a mean age of 65.4 years, and 56 eyes of 56 young patients who had a mean age 27.7 years. Two masked observers took three anterior segment OCT measurements and three A-scan ultrasonography measurements.
In elderly patients, anterior segment OCT had a failure rate of 9.1% and A-scan ultrasonography had a failure rate of 7.6%. All measurements were successful in young patients. Anterior segment OCT yielded markedly higher lens thickness values than A-scan ultrasonography. Agreement between observers' anterior segment OCT measurements was slightly higher than between observers' A-scan ultrasonography measurements.