Purpose: To investigate the effects of small scale illumination levels and refractive error type on the pupil size measured with Visante Optical Coherence Tomography in healthy eyes. Findings: Pupil size increased with illumination decrements. Mean pupil size was 3.5 mm at 550 lux, 4.2 mm at 350 lux, 5.2 mm at 150 lux, 5.03 mm at 40 lux, and 5.4 mm at 2 lux. In multi-pairwise comparison of the ...

Rapid and stable control of pupil size in response to light is critical for vision, but the neural coding mechanisms remain unclear. Here, we investigated the neural basis of pupil control by monitoring pupil size across time while manipulating each photoreceptor input or neurotransmitter output of intrinsically photosensitive retinal ganglion cells (ipRGCs), a critical relay in the control of ...

purpose: to report tonic pupil in a patient with ocular siderosis. case report: a 12-year-old male patient presented with over-sized right pupil from two weeks before. visual acuity (va) was 10/10 in both eyes without afferent pupillary defect. anisocoria was present with the right and left pupils, measuring 5 and 3 mm in diameter, respectively. anisocoria was greater in bright light and there ...

A computer model that incorporates the monochromatic aberrations of the eye is used to determine the optimal pupil size for axial and lateral resolution as it applies to retinal imaging instruments such as the confocal scanning laser ophthalmoscope. The optimal pupil size for axial resolution, based on the aberrations of 15 subjects, is 4.30 mm +/- 1.19 mm standard deviation (sd), which is larg...

A number of studies have been conducted to develop the mechanism and equations between pupil size and luminance [1,2]. The discovery of a new class of photosensitive cells in the retina, the intrinsically photosensitive retinal ganglion cells (ipRGCs), which send retinal information induced by ambient light to the brain center to partly control the physiological characteristics of human, in par...

PURPOSE To investigate, by high-precision digital analysis of data provided by Scheimpflug imaging, changes in pupil size and shape and anterior chamber (AC) parameters following cataract surgery. PATIENTS AND METHODS The study group (86 eyes, patient age 70.58±10.33 years) was subjected to cataract removal surgery with in-the-bag intraocular lens implantation (pseudophakic). A control group ...