IOBA-Eye Institute, Valladolid, Spain.
Evaluation of diagnostic technology.
To analyze intrasession repeatability, 1 experienced examiner measured eyes 9 times successively. To study intersession reproducibility, the same clinician obtained measurements from another set of eyes in 2 consecutive sessions 1 week apart. Ocular, corneal, and internal HOAs were obtained. Coma and spherical aberrations, 3rd- and 4th-order aberrations, and total HOAs were calculated for a 6.0 mm pupil diameter.
For intrasession repeatability (75 eyes), excellent intraclass correlation coefficients (ICCs) were obtained (ICC >0.87), except for internal primary coma (ICC = 0.75) and 3rd-order (ICC = 0.72) HOAs. Repeatability precision (1.96 ¡Á Sw) values ranged from 0.03 ¦Ìm (corneal primary spherical) to 0.08 ¦Ìm (ocular primary coma). For intersession reproducibility (50 eyes), ICCs were good (>0.8) for ocular primary spherical, 3rd-order, and total higher-order aberrations; reproducibility precision values ranged from 0.06 ¦Ìm (corneal primary spherical) to 0.21 ¦Ìm (internal 3rd order), with internal HOAs having the lowest precision (¡Ý0.12 ¦Ìm). No systematic bias was found between examinations on different days.
The intrasession repeatability was high; therefore, the device's ability to measure HOAs in a reliable way was excellent. Under intersession reproducibility conditions, dependable corneal primary spherical aberrations were provided.
No author has a financial or proprietary interest in any material or method mentioned.