Changes in conjunctival–scleral thickness after strabismus surgery measured with anterior segment optical coherence tomography
To evaluate changes in conjunctival–scleral thickness following strabismus surgery with anterior segment optical coherence tomography (AS-OCT).
Prospective, observational, consecutive case series.
Distances between the conjunctival epithelium and inner scleral wall were measured with AS-OCT before and 3–5 months after strabismus surgery. The measurements were performed at 1.5 mm (limbus), 7.0 mm (insertion), and 8.0 mm (tendon) posterior to the scleral spur on the lateral rectus muscle (LR); and 1.5 mm (limbus), 4.0 mm (insertion), and 5.5 mm (tendon) posterior to the scleral spur on the medial rectus muscle (MR). Thirty-three extraocular muscles (20 LRs and 13 MRs) from 23 subjects were studied.
Thicknesses were significantly less at the insertion (0.95–0.78 mm; p < 0.001) and tendon (0.99–0.78 mm; p < 0.001) after LR recession and at the tendon (1.21–0.92 mm; p = 0.02) after MR recession. Thicknesses were significantly greater at the insertion (0.82–1.07 mm; p = 0.01) and tendon (0.95–1.28 mm; p = 0.01) after MR resection or plication and at the limbus, insertion, and tendon (0.75–0.90 mm, 0.94–1.19 mm, 1.03–1.28 mm, respectively; all p = 0.04) after LR resection or plication.
Conjunctival–scleral thicknesses showed various changes after recession and resection or plication. These findings may help detect previous surgical operations when conjunctival scarring and ciliary vessel changes are unclear.
KeywordsAnterior segment optical coherence tomography Conjunctival–scleral thickness Recession Resection Strabismus surgery
This work was supported by JSPS KAKENHI [grant number JP16K11264]. We would like to thank Editage for English-language editing.
Conflicts of interest
H. Suzuki, None; A. Hikoya, None; M. Komori, None; R. Inagaki, None; T. Haseoka, None; S. Arai, None; Y. Takagi, None; Y. Hotta, None; M. Sato, None.