How Our Vision Works
To understand how contacts work, we must first understand how our own vision works. As a small overview, we can summarize there are four steps for us to properly "see" an image":
1) Visible light is gathered
2) Light is channeled to the back of the eye
3) Transduction occurs
4) The information goes to our brain where we interpret it
Visual perception begins as the eye focuses on light, causing its light waves to enter out eye. The waves go through the cornea, where it helps focus the light as it enters your eye. Then it passes through the pupil. The iris of the eye determines how much light to let in. The cornea and lens act together to project an inverted image on the retina. The image on the retina is transformed into electrical signals in a process called transduction. The retina contains many photoreceptor cells known as rods and cones. Rods are mostly for seeing things in dimmer light while cones are known to detect colour and shape in normal light. The rods and cones both contain a molecule called retinal, which is what is responsible for converting light into visual signals to be transmitted to the brain through nerve impulses.
Here is a simple and useful video that can summarize how our vision works:
1) Visible light is gathered
2) Light is channeled to the back of the eye
3) Transduction occurs
4) The information goes to our brain where we interpret it
Visual perception begins as the eye focuses on light, causing its light waves to enter out eye. The waves go through the cornea, where it helps focus the light as it enters your eye. Then it passes through the pupil. The iris of the eye determines how much light to let in. The cornea and lens act together to project an inverted image on the retina. The image on the retina is transformed into electrical signals in a process called transduction. The retina contains many photoreceptor cells known as rods and cones. Rods are mostly for seeing things in dimmer light while cones are known to detect colour and shape in normal light. The rods and cones both contain a molecule called retinal, which is what is responsible for converting light into visual signals to be transmitted to the brain through nerve impulses.
Here is a simple and useful video that can summarize how our vision works: