The macula has the highest concentration of cones in the eye. Most of the detailed vision comes through the work of the macula.Know More
The eye gives vision to the body and is a combination of nerves, cells and fluids. The optic nerve is the eye's largest sensory nerve and it carries electrical impulses to the eye. The choroid is the largest blood vessel responsible for carrying blood to the retina.
The following parts of the eye are visible when looking at it:
The eye uses the cornea to refract light and it accounts for most of the eye's ability to focus. The lens provides the remaining focusing power as it directs light to the retina, which is the layer of light-sensitive cells at the back of the eye. The retina is responsible for converting light into electrochemical signals that go to the brain. The retina contains receptor cells called rods and cones, which are necessary for night vision, acuity and color perception.
In the center of the retina is a small depression called the fovea centralis, or macula. The macula contains the highest concentration of cones and it is where the eye has the sharpest vision.Learn more about Human Anatomy
The white part of the eye is called the sclera, St. Luke's Cataract & Laser Institute explains. The sclera is made of tissue that is tough and opaque so that it can protect the eye. The optic nerve is attached to the back of the sclera.Full Answer >
Green eyes are the rarest in the world with only around 2 percent of the population having green eyes. Green eyes are sometimes mistaken for hazel eyes.Full Answer >
A fun and educational science project on the human eye could be to build a model of it. Different colored clays can be used for the different parts.Full Answer >
The average human eye blinks approximately once every four to six seconds, or 15 to 20 times a minute. However, the frequency varies under different conditions. Blinking tends to decrease during times of concentration and increase in nervous or stressful situations.Full Answer >