Abstract
Purpose :
To assess the state of the art and potential application of anterior chamber depth (ACD)/effective lens position (ELP) measurements in pseudophakes.
Methods :
In this study we proceeded to do three things: 1) Review the literature for identifying the devices capable of measuring ACD in pseudophakes 2) Compare in a small study involving six patients ultrasound versus optical methods. 3) Develop matrix methods to take advantage of ACD measurement to improve results on second eye cataract surgery.
Results :
In our study it was demonstrated that contact ultrasound is more repeatable than optical methods used in IOLMaster 500, though neither had the repeatibility required for reliable computation associated with second eye surgery planning. While IOLMaster does not recommend the use of the device to measure ACD in pseudophakes, it does provide a specific setting to do so. There is a reasonable agreement in the literature that for reliable measurements ultrasound and possibly other devices that are much less commonly accessible may be preferable to IOLMaster. Finally the matrix method was developed and demonstrated to use measured ACD, provided measurements within 0.1 mm can be obtained, to improve outcomes on a second eye to be operated of a cataract surgery, especially in circumstances where the patient needs to undergo surgery prior to the stabilization of the refraction in the first eye, due to postoperative anisometropia or other reasons.
Conclusions :
ACD/ELP measurement in pseudophakes can be very valuable and used as a specific tool for improving second eye cataract surgery. Its measurement in most circumstances today is best performed using ultrasound though novel optical technologies, despite limitations, are constantly improving.
This is an abstract that was submitted for the 2016 ARVO Annual Meeting, held in Seattle, Wash., May 1-5, 2016.