Comparison of anterior segment measurements with optical low-coherence reflectometry and rotating dual Scheimpflug analysis.
OBJECTIVE
To compare the anterior segment measurements obtained with optical low-coherence reflectometry (OLCR) (Lenstar LS 900, version 2.1.1) and rotating dual Scheimpflug analysis (Galilei G1, version 3).


METHODS
Private practice, Policlinic Lleida, Lleida, Spain.


METHODS
Prospective comparative observational study.


METHODS
The following measurements were performed in patients requiring a preoperative study for a refractive procedure or cataract surgery and healthy volunteers from the clinic's staff: central corneal thickness (CCT), anterior chamber depth (ACD), horizontal limbal distance (white-to-white distance [WTW]), pupil diameter, keratometry (K) readings at the steepest meridian (steep K) and the flattest meridian (flat K), corneal astigmatism power, and plus astigmatic cylinder. Measurements were taken using the OLCR device and rotating dual Scheimpflug analyzer. The main outcome measure was the degree of agreement between steep K, flat K, astigmatism power, cylinder axis, CCT, ACD, WTW, and pupil diameter measurements.


RESULTS
The study enrolled 100 eyes of 100 subjects. Steep K, flat K, corneal astigmatism power, cylinder axis, and WTW measurements with the OLCR device and Scheimpflug analyzer showed narrow 95% limits of agreement (LoA), which implies good agreement (P>.05, Bland-Altman plot analysis). In contrast, the range and 95% LoA for CCT, ACD, and pupil diameter values were statistically significantly different (P<.05, Bland-Altman plot analysis).


CONCLUSIONS
In clinical practice, the OLCR device and the rotating dual Scheimpflug analyzer system can be used interchangeably for WTW measurements and K readings but not for CCT, ACD, and pupil diameter values.


BACKGROUND
No author has a financial or proprietary interest in any material or method mentioned.
From Policlinic Lleida (Huerva) and the Department of Ophthalmology (Huerva, Soldevila), University Hospital Arnau de Vilanova, Lleida, and the Departments of Ophthalmology, Lozano Blesa University Clinic Hospital (Ascaso, Lavilla), and Instituto Aragonés de Ciencias de la Salud (Ascaso), Zaragoza, Spain. Electronic address: vhuerva@gmail.com.
Valentín
V
Huerva
From Policlinic Lleida (Huerva) and the Department of Ophthalmology (Huerva, Soldevila), University Hospital Arnau de Vilanova, Lleida, and the Departments of Ophthalmology, Lozano Blesa University Clinic Hospital (Ascaso, Lavilla), and Instituto Aragonés de Ciencias de la Salud (Ascaso), Zaragoza, Spain.
Francisco J
FJ
Ascaso
From Policlinic Lleida (Huerva) and the Department of Ophthalmology (Huerva, Soldevila), University Hospital Arnau de Vilanova, Lleida, and the Departments of Ophthalmology, Lozano Blesa University Clinic Hospital (Ascaso, Lavilla), and Instituto Aragonés de Ciencias de la Salud (Ascaso), Zaragoza, Spain.
Jordi
J
Soldevila
From Policlinic Lleida (Huerva) and the Department of Ophthalmology (Huerva, Soldevila), University Hospital Arnau de Vilanova, Lleida, and the Departments of Ophthalmology, Lozano Blesa University Clinic Hospital (Ascaso, Lavilla), and Instituto Aragonés de Ciencias de la Salud (Ascaso), Zaragoza, Spain.
Laura
L
Lavilla
D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000869:Anterior Eye Segment / Q000473:pathology*; D001251:Astigmatism / Q000175:diagnosis; D001699:Biometry / Q000379:methods; D003315:Cornea / Q000473:pathology; D063171:Corneal Pachymetry; D003941:Diagnostic Techniques, Ophthalmological; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010781:Photography; D011446:Prospective Studies; D011680:Pupil / Q000502:physiology; D041623:Tomography, Optical Coherence; D055815:Young Adult