Microperimetry Sensitivity Changes at the Functional Transition Zone and at the EZ Margins in X-Linked Retinitis Pigmentosa Treated With Gene Therapy.
Muhammad Usman Jamil, A Yasin Alibhai, Darin Curtiss et al.
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In 30 seconds
This post-hoc analysis of the randomized Skyline trial examined how photoreceptor ellipsoid-zone (EZ) structure related to microperimetry sensitivity in eyes with X-linked retinitis pigmentosa treated with gene therapy. Twenty-four eyes were analyzed: 12 treated and 12 untreated. Baseline distance from a retinal locus to the EZ margin did not correlate with whether that locus achieved a sensitivity improvement of ≥7 dB at 12 months in either dose group. High-dose eyes had greater average treatment effects than untreated eyes across retinal zones, although the abstract provides no numerical effect estimates.
Key findings
- Among 24 eyes, baseline distance to the EZ margin did not correlate with loci achieving ≥7 dB sensitivity improvement at 12 months in either dose group.
- High-dose eyes had a higher mean percentage of loci with ≥7 dB improvement than untreated eyes across the full grid, but not in regional analyses.
- High-dose eyes showed greater average treatment effects than untreated eyes in all retinal zones.
Why it matters
The findings suggest that retinal structure and baseline EZ-margin distance may not reliably identify the specific loci that will show substantial sensitivity gains after gene therapy. This is relevant to interpreting localized microperimetry outcomes and to designing future trials that select retinal regions for assessment.
What to keep in mind
This was a post-hoc analysis involving 24 eyes, with seven high-dose and five low-dose treated eyes; the abstract reports no numerical effect estimates.