Precision of higher-order aberration measurements with a new Placido-disk topographer and Hartmann-Shack wavefront?sensor

详细信息    查看全文

• 作者：Alberto Ló ; pez-Miguel ; MScAuthor Vitae ; Loreto Martí ; nez-Almeida ; MSc ; Marí ; a J. Gonzá ; lez-Garcí ; a ; PhD ; Marí ; a B. Coco-Martí ; n ; PhD ; Paloma Sobrado-Calvo ; PhD ; Miguel J. Maldonado ; MD ; PhD ; FEBO ; ^{maldonado@ioba.med.uva.es}
• 刊名：Journal of Cataract and Refractive Surgery
• 出版年：2013
• 出版时间：February, 2013
• 年：2013
• 卷：39
• 期：2
• 页码：242-249
• 全文大小：198 K

文摘

| Figures/TablesFigures/Tables | ReferencesReferences

Purpose

To assess the intrasession and intersession precision of ocular, corneal, and internal higher-order aberrations (HOAs) measured using an integrated topographer and Hartmann-Shack wavefront sensor (Topcon KR-1W) in refractive surgery candidates.

Setting

IOBA-Eye Institute, Valladolid, Spain.

Design

Evaluation of diagnostic technology.

Methods

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.

Results

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 S_w) 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.

Conclusions

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.

Financial Disclosure

No author has a financial or proprietary interest in any material or method mentioned.