Contents
Pupil Light Reflex of the Human Eye
by
Nilesh Meshram (02007027)
Anand Gajbhiye (02007030)
Viren Diwan (02007032)
Abstract:
The eye is an extraordinary molecular computer. Even though the structure and the working of the eye is very complex the functioning of the eye can be attributed to the interaction of the pupil, iris and lens. Since the topic chosen by us earlier was the computational eye where we intended to study the computation of visual information from light waves passing through eye, we now will restrict to “the pupil light reflex”. The amount of light entering the eye is determined by the size of pupil aperture. In dim light it’s best to take in as much light as possible, whereas in bright light it’s best to take in less light so as not to damage fragile structures inside the eye.Introduction:
Working of an eye: Light, reflecting from an object, let’s say a ball, first strikes the cornea, which is a small transparent area in the outer covering of the eye. Light then passes through the pupil, which is a hole that is surrounded by the iris, the color in our eyes. The iris expand or contract in response to light, so that the iris is small and the pupil large in dim or dark light and vice-versa in bright light. The light passes through the pupil to the lens which reverses the image so that an upside down image is displayed on the back of our eye to the retina where the signal is converted so that the brain can understand it. The pupil, iris, and lens have already manipulated the light waves that make up this image, and our visual system actively works on the light/image in many ways, hence, what we actually "perceive" is very much an augmented version of the "real" visual stimulus.Motivation:
The eyes are our windows to the outside world. These eyes enable us to see this world God has created for us. So we decided to explore something about this wonderful gift of the God in context with the subject we are learning.
