Visual Acuity Outcomes of 2 Target Locations for Inlay Implantation in Post-LASIK Patients
Narrative Responses:
Purpose
To compare the visual acuity outcomes of two target locations for inlay implantation for post-LASIK presbyopes
Methods
A chart review of non-dominant eyes with prior LASIK underwent corneal inlay implantation from April 2011 to December 2012. Uncorrected distance visual acuity (UDVA) and uncorrected near visual acuity (UNVA) were evaluated pre and post-operatively. Based on the pupil center-to-purkinje reflex (Pp-Pk) distance, two groups were created: small (≤300µm) and large (>300µm). Each group was further segregated into subgroups according to the distance of the inlay center to either the purkinje reflex (I-Pk) or midpoint of the pupil and purkinje reflex (I-M). The inlay position was classified 0-100, 101-200, 201-300, or 301-400µm, each from the midpoint and the purkinje reflex.
Results
In the 2,074 implanted eyes UNVA gained three lines (J6 to J2, p < 0.05) with a minimal UDVA change (20/16 to 20/20). Comparing subgroups, there was no significant difference in the change in visual acuity for I-M and I-Pk (p > 0.05 for UDVA and UNVA), for small Pp-Pk distance. For large Pp-Pk distance, there were no significant differences observed in the change in visual acuity for I-M and I-Pk subgroups (both; p > 0.05). Comparing I-M and I-Pk between subgroups likewise revealed no significant differences in the change in visual acuity (both; p > 0.05).
Conclusion
Both target locations yield similar and good improvements in UNVA. Small deviations from either target location do not significantly affect the results.