Static and dynamic pupillary characteristics in high myopic eyes with two implantable collamer lenses

To determine static and dynamic pupillometry characteristics before and after implantable collamer lens (ICL) (V4 and V4c) implantation.

Shanghai, China.

Prospective consecutive observational case series.

Patients who had either V4 or V4c ICL implantation were included in this observational study. An automatic quantitative pupillometry system (MonCv3) was used for pupillometry preoperatively and 1 week, 1 month, and 3 months after surgery. Static pupillometry measurements (pupil diameters [PDs] at 4 standardized illumination levels) and dynamic parameters (including initial PD, amplitude of contraction, latency of contraction, duration of contraction, velocity of contraction, latency of dilation, duration of dilation, and velocity of dilation) were measured.

The study comprised 98 eyes (50 patients). Mesopic and low photopic PDs declined by 0.32 mm and 0.27 mm, respectively, at 3 months after ICL implantation; scotopic PD declined at 1 week and recovered to preoperative levels at 3 months; and high photopic PD remained unchanged. Regarding the pupil light reflex, contraction amplitude and velocity declined after surgery, whereas other dynamic parameters remained unchanged. The static and dynamic pupillary characteristics were similar between the V4 and V4c ICL groups.

The V4 and V4c ICLs had similar influences on iris motility. ICL implantation had a miotic effect under mesopic and low photopic illumination conditions, resulting in decreases in pupil contraction amplitude and velocity in light reflexes.