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Subjective observations of vault for implantable lens correspond closely to objective OCT measures

Am J Ophthalmol. 2009;147(6):978-983.

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Objective and subjective measurements of vault for an implantable lens were closely correlated, according to a study.

The observational study included 452 eyes of 246 patients that received the Visian Implantable Collamer Lens (ICL, STAAR Surgical). Investigators used an optical section during slit lamp examination to make subjective vault measurements on five levels (0 to 4). Visante optical coherence tomography (Carl Zeiss Meditec) was used to make objective vault measurements.

The average objective vault value was 414 ± 228 µm. The average subjective vault was 2.1 ± 1. The correlation was statistically significant (P < .001). Differences between the five subjective levels of vault were also statistically significant (P < .001).

A subjective vault value of 0 corresponded with an objective mean OCT value of 62 µm in 31 eyes; subjective vault of 1 corresponded with objective mean OCT of 203 µm in 83 eyes; vault of 2 with OCT of 402 µm in 206 eyes; vault of 3 with OCT of 594 µm in 95 eyes; and vault of 4 with OCT of 794 µm in 37 eyes.

"In 99% of cases within the [confidence interval], objective values for eyes subjectively classified within a certain level vary within a narrow interval (±25 to 80 µm) around the mean value, and this interval is characteristic of each subjective level," they said.