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Naoichi Horio, MD; Syu Kachi, MD; Kenji Hori, MD; Yoko Okamoto, MD; Etsuko Yamamoto, MD; Hiroko Terasaki, MD; Yozo Miyake, MD

Arch Ophthalmol. 2001;119:1329-1332.

Objective  To study whether optical coherence tomography (OCT) scans correlate retinal histologic findings with the progression of retinal degeneration in retinal degeneration slow (rds) mice.

Methods  Sensory retinal thickness (SRT) and outer retinal thickness (ORT), representing photoreceptor cell layer, in temporal retina at a distance 1 to 2 disc diameters from the optic disc were measured using scan profile in OCT from 6 healthy mice (16 weeks old) and 2-week-old (n = 6), 6-week-old (n = 4), and 60-week-old (n = 2) rds mice. Histologic sections were obtained from Epon-embedded retinas from the corresponding location.

Results  Cross-sectional OCT images correlated to the corresponding histologic sections in each mouse. Both SRT and ORT of 2-week-old rds mice (150 ± 4 µm and 28 ± 4 µm, respectively) lacking photoreceptor outer segments were already shorter than those of healthy mice (174 ± 5 µm and 37 ± 6 µm, respectively) (P<.001). In 6-week-old mice, microscopic findings revealed a decreased number of nuclei in the outer nuclear layer, and SRT and ORT (136 ± 2 µm and 20 ± 1 µm, respectively) were shorter than those of 2-week-old rds mice (P<.001). The SRT of 60-week-old rds mice without a photoreceptor layer was remarkably reduced (120 ± 7 µm), and no ORT could be measured.

Conclusion  Our findings suggest a possible relationship between SRT and ORT, as measured by OCT, and histologic change in retinal degenerative diseases.

Clinical Relevance  The quantitative analysis obtained by OCT scans may have potential to detect progressive change in degenerative retina and may be used in studying human retinal degeneration.

From the Department of Ophthalmology, Nagoya University School of Medicine, Nagoya, Japan.

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