Anterior segment biometry with 2 imaging technologies: Very-high-frequency ultrasound scanning versus optical coherence tomography

Abstract

The Artemis 2 and the Visante OCT systems provide equivalent and repeatable measurements of the ACD, CCT, and ATA and can be used interchangeably for these purposes.

Intrasubject repeatability of corneal morphology measurements obtained with a new Scheimpflug photography–based system

“…All these measurements are obtained quickly and do not require the use of anesthesia or contact with the cornea, as required when using ultrasoundbased systems. 5 Several commercially available anterior segment analysis systems based on Scheimpflug photography have been shown to provide repeatable measurements of different anatomic parameters. [6][7][8][9][10][11][12][13][14] Recently, a new device based on the combination of Scheimpflug photography and Placido-disk technology was introduced into clinical practice.…”

“…In addition to pachymetry, excellent consistency was also obtained for ACD and WTW parameters, with repeatability comparable to that reported for several other devices. 5,6,9,20,25,26 In summary, this new Sirius topography system based on the combination of a rotating Scheimpflug camera and a Placido disk provided repeatable anterior and posterior curvature and shape-factor measurements as well as pachymetry measurements using a fast, noninvasive technique. In addition, the device provided WTW and ACD measurements with excellent intrasubject repeatability.…”

Anterior segment optical coherence tomography in eye injuries

“…OCT is limited by the iris pigment epithelium; therefore, UBM must be used to visualize the ciliary body. These methods have not been compared in the literature, but the quality of imaging seems to be similar [19][20][21]. In ophthalmic departments dealing with ocular trauma, AS OCT is a very valuable device for diagnosis and for monitoring treatment outcomes following various types of eye injuries.…”

A Comparison of Three Techniques for Measurement of Intraocular Pressure in Normal Eyes

“…The CCT measurements were obtained using Visante OCT from Zeiss (Carl Zeiss Meditec, Dublin, CA, USA). To eliminate the disadvantages of ultrasound pachymetry, such as physical contact with the cornea, topical anesthesia was used; the accuracy of measurements was dependent on the perpendicularity of the probe's application to the cornea, and reproducibility relied on precise probe placement on the corneal centre [13].…”