Researchers Identify 'Light Meter' That Controls Pupil Constriction Date: October 4, 2004 Source: Washington University School Of Medicine Summary: When bright light shines in the eye, the pupil ...

Other drugs of abuse can also affect the eyes, but heroin and opioids are unique in causing the constriction of the pupils. In fact, most other substances will cause the pupils to dilate, or enlarge.

Brain activity (above) corresponds to pupil dilation in a sleeping mouse's eye (below). ÖZGE YÜZGEÇ, MARIO PRSA, ROBERT ZIMMERMANN, DANIEL HUBER Swiss scientists developed a novel method of studying ...

On real-time assessment of the pupil with external light source, there was a significant difference between fellow eye pupil diameter (2.9 ± 0.89 mm) and RAPD eye diameter (3.7 ± 1.06 mm) (P < .05).

Our research reveals that constricted pupils enhance physical attractiveness by making the eyes appear brighter. “Appearance isn’t everything, of course, but sometimes we do want to look our best.

Take a domestic cat: its pupil area can change by a factor of 135 from fully dilated to fully constricted, whereas the round human pupil can only change area by a factor of 15.

A blue glare illusion was perceived to be brightest and caused larger pupil constriction The Department of Computer Science and Engineering at Toyohashi University of ...

Thin slits in cats — as opposed to circular pupils — allow for a huge change between the constricted and dilated states, and are capable of undergoing a 135-to-300-fold change in area.

Uncorrected visual acuity was count fingers at 2 feet in the right eye and 20/25 in the left eye. The right pupil was minimally reactive to light while the left pupil constricted briskly to light.

Although the constricted pupil is round in most species, in some animals it can be a vertical or horizontal slit, or even, as in some geckos, composed of several tiny pinholes.