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Paper Information

Journal:   JOURNAL OF OPHTHALMIC AND VISION RESEARCH   2016 , Volume 11 , Number 3; Page(s) 245 To 251.
 
Paper: 

CENTRAL CORNEAL THICKNESS MEASUREMENT USING ULTRASONIC PACHYMETRY, ROTATING SCHEIMPFLUG CAMERA, AND SCANNING?SLIT TOPOGRAPHY EXCLUSIVELY IN THIN NON?KERATOCONIC CORNEAS

 
 
Author(s):  MOHAMMADPOUR MEHRDAD*, MOHAMMAD KAZEM, KARIMI NASSER
 
* EYE RESEARCH CENTER, FARABI EYE HOSPITAL, QAZVIN SQUARE, TEHRAN 13366, IRAN
 
Abstract: 

Purpose: To evaluate the agreement among Pentacam, Orbscan and ultrasound (US) pachymetry for measurement of central corneal thickness (CCT) in thin corneas with normal topographic pattern.
Methods: We included 88 eyes of 44 refractive surgery candidates with thinnest pachymetric readings of 500 micrometers (
mm) or less on Orbscan, a normal topographic pattern, no sign of keratoconus, and best corrected visual acuity (BCVA) of 20/20. Pentacam, Orbscan and US were performed in one session by the same examiner. Exclusion criteria were history of ocular surgery, topographic abnormalities suggesting forme fruste keratoconus or keratectasia, and recent contact lens wear.
Results: The difference in CCT measurements by US pachymetry and Orbscan II [using an acoustic factor (AF) of 0.92] ranged from ?34 to+34
mm. The difference between the thinnest point and central readings measured by US reached 16 mm with Orbscan II (AF: 0.92) and 2 mm with Pentacam. Mean differences between the employed devices were 0.2 mm for Pentacam versus US (P=0.727), 30.1 mm for uncorrected Orbscan versus US (P<0.001), 10.4 mm for Orbscan II (AF=0.92) versus US (P<0.001), and 0.2 mm for Orbscan II (AF=0.94) versus US (P=0.851).
Conclusion: In normal thin corneas, Pentacam demonstrated better agreement with US pachymetry as compared to corrected Orbscan readings. Results achieved by Orbscan were better consistent with US pachymetry using an AF of 0.94. We speculate that a dynamically graded AF in reverse proportion to CCT constitutes a better approach for correcting Orbscan measurements.

 
Keyword(s): CENTRAL CORNEAL THICKNESS, ULTRASONIC PACHYMETRY, ROTATING SCHEIMPFLUG IMAGING, SCANNING-SLIT TOPOGRAPHY, NON-KERATOCONIC CORNEA
 
 
References: 
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Citations: 
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+ Click to Cite.
APA: Copy

MOHAMMADPOUR, M., & MOHAMMAD, K., & KARIMI, N. (2016). CENTRAL CORNEAL THICKNESS MEASUREMENT USING ULTRASONIC PACHYMETRY, ROTATING SCHEIMPFLUG CAMERA, AND SCANNING?SLIT TOPOGRAPHY EXCLUSIVELY IN THIN NON?KERATOCONIC CORNEAS. JOURNAL OF OPHTHALMIC AND VISION RESEARCH, 11(3), 245-251. https://www.sid.ir/en/journal/ViewPaper.aspx?id=511236



Vancouver: Copy

MOHAMMADPOUR MEHRDAD, MOHAMMAD KAZEM, KARIMI NASSER. CENTRAL CORNEAL THICKNESS MEASUREMENT USING ULTRASONIC PACHYMETRY, ROTATING SCHEIMPFLUG CAMERA, AND SCANNING?SLIT TOPOGRAPHY EXCLUSIVELY IN THIN NON?KERATOCONIC CORNEAS. JOURNAL OF OPHTHALMIC AND VISION RESEARCH. 2016 [cited 2021August01];11(3):245-251. Available from: https://www.sid.ir/en/journal/ViewPaper.aspx?id=511236



IEEE: Copy

MOHAMMADPOUR, M., MOHAMMAD, K., KARIMI, N., 2016. CENTRAL CORNEAL THICKNESS MEASUREMENT USING ULTRASONIC PACHYMETRY, ROTATING SCHEIMPFLUG CAMERA, AND SCANNING?SLIT TOPOGRAPHY EXCLUSIVELY IN THIN NON?KERATOCONIC CORNEAS. JOURNAL OF OPHTHALMIC AND VISION RESEARCH, [online] 11(3), pp.245-251. Available: https://www.sid.ir/en/journal/ViewPaper.aspx?id=511236.



 
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