TY - JOUR
T1 - Corneal powers measured with a rotating Scheimpflug camera
AU - Næser, Kristian
AU - Savini, Giacomo
AU - Bregnhøj, Jesper Flethøj
PY - 2015/12/23
Y1 - 2015/12/23
N2 - Background/aim Keratometry measures the anterior corneal curvature only. Corneal power is calculated by multiplication with the keratometric refractive index, which takes into account the average negative posterior corneal power. The aim of this study was to calculate and compare various expressions for total corneal power assessed with Scheimpflug camera techniques, which also measure the posterior corneal curvature. Methods We used the Pentacam rotating Scheimpflug camera to measure the equivalent power, total corneal refractive power (based on Snell's law ray tracing), and simulated keratometry (keratometric refractive index=1.3375) over the central 3.0 mm zone in 951 eyes. The keratometric refractive index of the equivalent power and the total corneal refractive power was calculated as the ratio between these values and the anterior corneal curvature. Results The equivalent power, total corneal refractive power, and simulated keratometry all differed statistically significantly (analysis of variance, p
AB - Background/aim Keratometry measures the anterior corneal curvature only. Corneal power is calculated by multiplication with the keratometric refractive index, which takes into account the average negative posterior corneal power. The aim of this study was to calculate and compare various expressions for total corneal power assessed with Scheimpflug camera techniques, which also measure the posterior corneal curvature. Methods We used the Pentacam rotating Scheimpflug camera to measure the equivalent power, total corneal refractive power (based on Snell's law ray tracing), and simulated keratometry (keratometric refractive index=1.3375) over the central 3.0 mm zone in 951 eyes. The keratometric refractive index of the equivalent power and the total corneal refractive power was calculated as the ratio between these values and the anterior corneal curvature. Results The equivalent power, total corneal refractive power, and simulated keratometry all differed statistically significantly (analysis of variance, p
UR - http://www.scopus.com/inward/record.url?scp=84954506729&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84954506729&partnerID=8YFLogxK
U2 - 10.1136/bjophthalmol-2015-307474
DO - 10.1136/bjophthalmol-2015-307474
M3 - Article
AN - SCOPUS:84954506729
JO - British Journal of Ophthalmology
JF - British Journal of Ophthalmology
SN - 0007-1161
ER -