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Repeatability of AcuTarget measurements and comparison to OPD-Scan III and Orbscan II

Poster Details

First Author: E.Guilbert FRANCE

Co Author(s):    A. Saad   D. Gatinel           

Abstract Details


To assess repeatability of AcuTarget and to compare readings obtained with AcuTarget to those obtained with OPD-Scan III and Orbscan II.


Patients were recruited prospectively from the Department of Refractive Surgery, Rothschild Ophthalmic Foundation, Paris, France.


Exclusion criteria were previous ocular surgery or ocular pathology other than refractive error. Each patient had a subjective refraction then measurements with AcuTarget, Orbscan II and OPD-Scan III were performed under mesopic conditions. Measurements with AcuTarget where performed 3 times in order to assess the repeatability of this device using intraclass correlation coefficients (ICCs). Differences between the devices were assessed using the paired Student t test. Pearson correlation coefficients were determined to show the correlations between data.


Sixty-two eyes of 31 patients (15 men, 16 women) were included. Agreement of 3 successive measurements performed during the same visit was good for AcuTarget readings with ICCs greater than 0.75. Pupil versus vertex measurements along the X-axis obtained with AcuTarget and OPD-Scan III under mesopic conditions were not significantly different and were strongly correlated with each other. Furthermore, the comparison between the two devices for cord length measurement showed no significant difference and a good correlation between the 2 systems was observed. Conversely, a statistically significant difference between the 2 systems was observed for measurements along the Y-axis. Kappa angle estimation obtained with Orbscan II correlated well with both AcuTarget and OPD-Scan III estimation of pupil versus Purkinje cord length, with Pearson correlation coefficients of 0.671 and 0.639 (p<0.001), respectively.


Repeatability of AcuTarget measurement was substantial and close to excellent. Data obtained with AcuTarget are not interchangeable with those obtained with OPD-Scan III and Orbscan II.

Financial Disclosure:

... receives consulting fees, retainer, or contract payments from a competing company

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