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Interchangeability among five devices that measure anterior eye distances.

Authors :: Domínguez-Vicent A
Pérez-Vives C
Ferrer-Blasco T
Albarrán-Diego C
Montés-Micó R
Source :: Clinical & experimental optometry [Clin Exp Optom] 2015 May; Vol. 98 (3), pp. 254-62. Date of Electronic Publication: 2015 Mar 19.
Publication Year :: 2015
Abstract: Purpose: The aim was to study the interchangeability of various devices that measure anterior chamber depth (ACD) and white-to-white (WTW) distance.<br />Methods: Eighty right eyes of eighty patients aged 20 to 40 years were included. Their spherical equivalent ranged from -4.25 to +1.00 dioptres. Each eye's ACD and the WTW distance were measured using the following devices: a Castroviejo surgical calliper, CA-200F Corneal Analyser, Orbscan II, Pentacam HR and IOLMaster 500.<br />Results: The Pentacam HR measured significantly greater ACD (p < 0.01) than the other two devices, whereas IOLMaster 500 and Orbscan II yielded comparable (p > 0.01) distances. Nonetheless, in every device comparison, the mean difference was within clinically acceptable limits. The device comparison showed that for WTW distance measurements IOLMaster 500 yields the greatest value (p < 0.01), whereas CA-200F Corneal Analyser yields the smallest one (p < 0.01).<br />Conclusion: Pentacam HR, Orbscan II and IOLMaster 500 can be used interchangeably to measure ACD, whereas Orbscan II, IOLMaster 500, Castroviejo surgical calliper and CA-200F Corneal Analyser cannot be considered interchangeable, when it comes to measuring WTW distance.<br /> (© 2015 The Authors. Clinical and Experimental Optometry © 2015 Optometry Australia.)