Validity and repeatability of the Aladdin ocular biometer.
OBJECTIVE
To assess the accuracy and reproducibility of biometry undertaken with the Aladdin (Topcon, Tokyo, Japan) in comparison with the current gold standard device, the IOLMaster 500 (Zeiss, Jena, Germany).


METHODS
University Eye Clinic, Birmingham, UK and Refractive Surgery Centre, Kiel, Germany.


METHODS
The right eye of 75 patients with cataracts and 22 healthy participants were assessed using the two devices. Measurements of axial length (AL), anterior chamber depth (ACD) and keratometry (K) were undertaken with the Aladdin and IOLMaster 500 in random order by an experienced practitioner. A second practitioner then obtained measurements for each participant using the Aladdin biometer in order to assess interobserver variability.


RESULTS
No statistically significant differences (p>0.05) between the two biometers were found for average difference (AL)±95% CI=0.01±0.06 mm), ACD (0.00±0.11 mm) or mean K values (0.08±0.51 D). Furthermore, interobserver variability was very good for each parameter (weighted κ≥0.85). One patient's IOL powers could not be calculated with either biometer measurements, whereas a further three could not be analysed by the IOLMaster 500. The IOL power calculated from the valid measurements was not statistically significantly different between the biometers (p=0.842), with 91% of predictions within±0.25 D.


CONCLUSIONS
The Aladdin is a quick, easy-to-use biometer that produces valid and reproducible results that are comparable with those obtained with the IOLMaster 500.
College of Medical and Dental Sciences, University of Birmingham, , Birmingham, UK.
Priyanka
P
Mandal
Emma J
EJ
Berrow
Shehzad A
SA
Naroo
James S
JS
Wolffsohn
Detlef
D
Uthoff
Detlef
D
Holland
Sunil
S
Shah
D000328:Adult; D000368:Aged; D000867:Anterior Chamber / Q000033:anatomy & histology*; D001699:Biometry / Q000295:instrumentation*; D002386:Cataract / Q000175:diagnosis*; D003941:Diagnostic Techniques, Ophthalmological / Q000295:instrumentation*; D004867:Equipment Design; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D012372:ROC Curve; D015203:Reproducibility of Results
Eye (Globe); Imaging