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This study used OCT to investigate the changes in the central macular thickness, subfoveal choroidal thickness (SFCT) and retinal nerve fibre layer (RNFL) after horizontal rectus surgery for patients with strabismus. This was a retrospective study and patients were grouped into 1) recession surgery, and 2) recession / resection surgery. OCT was done preoperatively and at one day, one week, one month, three months and six months postoperatively. The study included 65 eyes of 50 patients. Group included 14 males and 11 females aged 8.96 ±7.97 years. Group 2 included 12 females and 13 males aged 15.17 ±6.81 years. There was a significant difference in age between groups but no significance for gender. None had severe amblyopia or anisometropic amblyopia. For group 1, preoperative, one day and one week postoperative mean central macular thickness (CMT) was 259.33 ±33.65um, 270.88 ±34.38um and 261.35 ±33.9um respectively. For group 2 these values were 265.6 ±28.06um, 278.48 ±28.63um and 269.12 ±27.31um respectively. Pre to post comparisons showed increase in CMT for pre to one day and one week measurements but these were not significant for pre to one, three and six month measurements. For group 1, preoperative, one day and one week postoperative mean SFCT was 342.88 ±29.57, 355.53 ±30.11 and 345.35 ±28.58 respectively. For group 2 these values were 331.56 ±41.75, 350.32 ±45.63 and 337.6 ±41.88 respectively. There was an increase for these measurements from pre to post but not significant for pre to one-to-six-month comparisons. There was no significant change in RNFL measurements. The temporary increase in CMT and SFCT in both groups was suggested to be due to a temporary disruption in choroidal circulation because of damage to anterior ciliary arteries during strabismus surgery, or potentially due to periocular inflammation.

Influence of one or two horizontal muscle surgeries on OCT findings.
Alis MG, Alis A.
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Fiona Rowe (Prof)

Institute of Population Health, University of Liverpool, UK.

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