Dr.ABHISHEK HOSHING
Purpose: To assess the sensitivity & specificity of Retinoscopic Scissor Reflex (RSR) in detecting Keratoconus (KC)
Methodology: Patients with RSR in one or both eyes were included. Scheimpflug based corneal tomography scans of both eyes of each patient were assessed for the presence of KC by a masked corneal surgeon. Sensitivity & Specificity of RSR in diagnosing KC was calculated by making two by two table.
Results: 36 eyes of 18 patients with mean±SD age 19.5±11.8 were analyzed. RSR was noted in 25 eyes. The specificity & sensitivity of the RSR in detecting KC was 40% and 81.25% respectively. Specificity & sensitivity of RSR in detecting corneal astigmatism of ≥ 3.00 D was 40 & 90% respectively and ≥2.00 D was 52.94 and 89.47% respectively. The positive & negative predictive value of RSR in detecting KC was 52 and 72.7% respectively.
Conclusions: Scissors reflex is moderately accurate in detecting Keratoconus. Absence of scissors reflex rules out Keratoconus with high accuracy.
Leave a Comment