Repeatability of Oculus Pentacam Metrics Derived From Corneal Topography

Abstract

The Oculus Pentacam provides repeatable measures of the metrics derived from corneal topography over the tested time scales. In subjects aged from 19 to 40 years, topography measurements and their respective variability did not seem to change significantly with age.

Comparability and repeatability of corneal astigmatism measurements using different measurement technologies

“…4,23,24 For manual keratometry, the reported s w ranges from 0.08 D (3 repeated measurements) to 0.10 D (10 repeated measurements). 23,33 The s w of the Pentacam device in measuring the anterior corneal radius is reported to be 0.02 mm (3 repeated measurements), which corresponds to an s w of 0.80 D. 34 To our knowledge, no previous studies have examined the s w of repeated measurements obtained with the SMI Reference Unit or KR-1W corneal topographer. Ideally, before calculating the toric IOL cylinder power in each patient, a series of repeated measurements should be obtained to ensure that the repeatability of the magnitude and the meridian of astigmatism is acceptable.…”

Changes of anterior chamber architecture induced by laser peripheral iridotomy in acute angle closure crisis

“…It has been described before that the Pentacam is a reliable tool for anterior segment examination with high repeatability and good intra-observer reliability [17][18][19][20]. It was the main aim of the undertaken investigation to analyze the changes in anterior chamber architecture induced by LPI in patients with one-sided angle closure crisis in the eye suffering from acute crisis and in the fellow eye.…”

Assessment of anterior and posterior corneal indices using two Scheimpflug analyzers

“…As we moved peripherally, the correlation remained high, albeit not as strong as that in the central area. Similarly, other authors have reported an increase in variability in corneal pachymetry measurements from the center to the periphery, particularly in the superior cornea (4,(14)(15)(16)(17) . They attributed this variability to the effects of the superior eyelid (4) .…”

“…Similarly, other authors have reported an increase in variability in corneal pachymetry measurements from the center to the periphery, particularly in the superior cornea (4,(14)(15)(16)(17) . They attributed this variability to the effects of the superior eyelid (4) . We believe that the differences observed in paracentral (peripheral) values were very pre dictable because small decentration in the BFS would lead to a false high value, considering that the peripheral cornea is farther away from the BFS because of its prolate shape.…”

“…To standardize the tear film meniscus and account for tear film abnormalities that may influence Placido measurements, a drop of carboxymethyl ce llulose artificial tears was instilled in the fornix of each eye, and measurements were obtained 3 min later to ensure that the tear film meniscus was back to its normal thickness (4) . Both eyes were measured.…”