Abstract

DO.17.08

Objective measurements of accommodation in scleral spacing procedure (SSP) patients with the iTrace Visual Function Analyzer (VFA)

Soloway B.
Vision Correction, New York Eye and Ear Infirmary

Objective: To demonstrate objective measurements of accommodation with the iTrace Visual Function Analyzer (VFA) in patients who have undergone the Scleral Spacing Procedure (SSP) for Presbyopia with Refocus PresVIEW Scleral Implants (PSI).
Methods: The Tracey iTrace VFA has become recognized as an instrument that is capable of measuring accommodation objectively in both phakic and psuedophakic eyes as it is able to map refractive power across the pupil during fixation at any distance through an open field of view. A preliminary study of fifteen operative eyes of eight patients who have undergone SSP was performed using the iTrace VFA. The power refraction wavefront map was obtained viewing snellen letters at 20 foot distance and Sloan letters at 50 cm near (2 diopter) fixation in these eyes. The difference plot between these two measurements was then performed in order to assess the depth of field in near vision during fixation. This depth of field of near vision was then compared to near acuity in each eye of these subjects.
Results: The operative eyes were found to have a depth of field in near vision of 1.20 ± 0.60 diopters with a total range of 0.50 to 2.50 diopters. There was a trend correlating better depth of field in near vision with the ability to read smaller print however the small sample size limited the significance of this correlation.
Conclusions: The iTrace has been demonstrated to be an effective tool in assessing the efficacy of procedures intended to restore accommodation. Here it has shown objective measurements of accommodation in each of fifteen eyes of eight SSP patients. Further studies with larger numbers of patients undergoing SSP both pre and post op will be assessed along with age matched.

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