How does the pupil relate to psychology?

Pupils respond to three distinct kinds of stimuli: they constrict in response to brightness (the pupil light response), constrict in response to near fixation (the pupil near response), and dilate in response to increases in arousal and mental effort, either triggered by an external stimulus or spontaneously.

What is the test for pupillary response?

PERRLA is an acronym used to document a common pupillary response test. This test is used to check the appearance and function of your pupils. The information can help your doctor diagnose several conditions, from glaucoma to neurological diseases.

Why do we check pupillary response?

Pupillary assessment is an important part of neurological assessment because changes in the size, equality and reactivity of the pupils can provide vital diagnostic information in the critically ill patient (Smith, 2003). Both pupils should be the same shape, size and react equally to light.

What is Pupillometry in psychology?

Pupillometry is defined as a measure of pupil dilation, giving unique insights into how an individual views their environment.

What is the function of these pupillary responses?

This relates to the pupil’s purpose of receiving external light — the pupillary response moderates the amount of light the pupil receives in order to bring about the best conditions for vision. Constriction or dilation of the pupils in response to differing light conditions is a form of pupillary response known as the pupillary light reflex.

What is the normal pupil response to light?

Note the shape and size of the pupils in ambient bright light. Size is measured in millimetres and the normal pupil ranges from 1-8 mm. When pupillary function is normal, pupils are isocoric (equally sized) and react equally to light.

What was the pupillary consensual response?

A consensual pupillary reflex is response of a pupil to light that enters the contralateral (opposite) eye . Thus there are four types of pupillary light reflexes, based on this terminology of absolute (left versus right) and relative (same side versus opposite side) laterality:

What does pupillary reflex mean?

The pupillary light reflex ( PLR) or photopupillary reflex is a reflex that controls the diameter of the pupil , in response to the intensity ( luminance) of light that falls on the retinal ganglion cells of the retina in the back of the eye, thereby assisting in adaptation of vision to various levels of lightness/darkness.