Comparative assessment of pupillary oscillation and blinking rate between emmetropes and myopes

Abstract

Aim of this study was to investigate for a relationship between pupillary oscillations (PO) and blinking rate (B) in various vision deprived states such as in refractive errors (Myopes).: A case control descriptive study with 340 individuals, including 220 myopes and 120 emmetropes were compared for pupillary oscillation rate (PO), blinking rate (B) and Pupillary oscillation/blinking rate (PO/B) ratio bilaterally in normal as well as in individual subgroups of decreasing visual acuity, done under slit lamp in dim diffuse illumination. The pupillary oscillation rate (PO) was 49.23± 8.80 in right eye (POR) and 56.44 ±8.95 in left eye (POL) in the control group whereas it was 46.28 ±11.55 and 52.79 ±11.22 in the right and left eyes respectively of the cases. While PO/B ratio was 12.41±14.11 in the right eye and 14.33±15.9 in the left eye in control group, it was 7.13 ± 7.86 in the right and 8.18 ±9.07 in the left eye of the cases respectively. The blinking rate (B) was 8.62 ±6.06 in the control eyes and in the cases it was 11.69 ±7.91. The comparative analysis of all of the above parameters were statistically significant with p < 0.001 between cases and controls. POR = POL in 5.0%, POR > POL in 7.50% and POR < POL in 87.50%.: This study could be useful in non-verbal patients and comatose patients as diagnostic and prognostic tool, having an implication in different refractive errors and neurological diseases.