الفهرس 
Anatomy of the Anterior Segment of The EyeOnly 14 pages are availabe for public view
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Abstract
Measuring parameters of anterior segment of the eye accurately is important for diagnosing variety of diseases and for planning for surgeries and postsurgical follow up. The true values of anterior chamber depth (ACD), corneal power (K-readings), corneal astigmatism and white -to -white (WTW) are essential in ophthalmological practice.
Different technologies are used in measurement of the structures of the anterior segment. In recent years, two of the most common devices used for assessment of anterior segment are Pentacam and IOL master.
The Pentacam obtains images of the anterior segment by a rotating Scheimpflug camera. While, the IOL master is based on laser partial coherence interferometry (PCI).
Pentacam can give very informative data about the cornea including corneal thickness map, curvature map, elevation map. Also, it can measure ACD, horizontal WTW accurately.
IOL master can measure Axial length of the eye, ACD, corneal curvature and horizontal WTW.
In this study, we compared between anterior segment parameters (corneal curvature – ACD – WTW) values obtained by Pentacam occulus and IOL master 500.
Forty eyes of 22 Egyptian individuals included in this study according to inclusion criteria and they were examined by both Pentacam and IOL master in the same session.
By comparing results, we found that there is statistically significant difference between values of K-readings measured by both devices as IOL master gives higher K-reading value than Pentacam
The study also found almost no statistically significant difference between both devices in measuring ACD which means that both devices can be used interchangeable to each other.
The study showed moderate statistically significant difference between both devices in measuring WTW. Pentacam gives higher WTW value than IOL master if we use the method of manual placing of calipers on Sheimpflug image.