Month: March 2019

Eyes: World inside the Retina

Eyes are one of the most fascinating and complex organs of our body. Upon visiting a doctor, one of the first things he does is examines your eyes. Why? It is because, just a glance at the eyes gives an insight to the health of an individual. Eyes are one of the most important senses, more of the brain is dedicated to seeing than any other senses.

Human eyes are just lenses with a resolution of 576 megapixels, which captures light, but what we actually see is an interpretation by our brain, so the brain sees through our eyes. Everything we see through our eyes is an upside down image of an object, our brain interprets the image the right way.

It is one of the fastest muscles in our body and responds to a stimuli quicker than any other part. Human eye reacts to pressure and is light-sensitive which allows vision. It provides a three-dimensional view of all its surroundings. Eyes are enclosed in a eye-socket made up of several bones fixed to the skull forming a four-sided pyramid like structure.

A brief mechanism of eyes: Light enters pupil and is focused at the back of the eye onto the retina. Retina converts this light received as a signal into electrical impulses. Optic nerves present is responsible to carry these signals generated to the brain where impulses are processed further.

Structure Of The Eye

Structure of eye is mainly composed of tissues, containing specialized cells. Tissues of the eyes consists of three layers, namely:

  • Light is focused on refractive tissues
  • Tissues sensitive to light
  • Tissues providing support

Refractive Tissues

These tissues consist of the pupil which is a dark spot in the centre. It expands and shrinks as a result of responding to light. The coloured portion of the … Read More...