An image is formed in the human eye when light passes through the pupil, is refracted by the lens and is absorbed by pigment cells in the retina, altering the pigments and triggering neurons to fire. The particular arrangement of the stimulated cells is interpreted by the brain into a separate image for each eye. The two eyes look at images from slightly different angles, allowing the perception of depth.
The human eye is a complex organ capable of perceiving relatively great detail. While other organisms have better vision in low-light conditions or at great distances, the combination of precise color perception, depth perception and general acuity at close distances is very strong in humans. The eyes are capable of adapting to varying distance and light levels.
When light passes through the lens, it is inverted, so light that hits the top of the retina comes from the bottom of the field of view and the light on the left of the retina comes from the right part of the field of view. The brain automatically reorients this information to its proper location. The retina has two different types of sensors, rods and cones, which are responsible for low-light vision and color vision, respectively.Learn More
The human eye is the equivalent of 576 megapixels, according to Gizmodo. The calculation is not entirely accurate because the eye is more like a video stream than a still camera, notes Dr. Roger Clark, a scientist and photographer.Full Answer >
The human eye is able to see images and colors because of the specialized photoreceptor cells in the retina called rods and cones. The membranes within these receptors contain pigments that undergo chemical changes when they absorb light. The chemical changes trigger electrical signals that travel to the brain, where they are interpreted as colors and visual images.Full Answer >
According to The Merck Manual Home Health Handbook, light travels through the sclera, cornea, pupil and lens before stopping at the retina, respectively. Once at the retina, the information from the light is converted to electrical impulses for the brain to interpret.Full Answer >
Accommodation refers to the ability of the eye's lens to change shape in order to focus on objects at different distances. The lens rounds to focus on nearer objects and flattens to focus on objects farther away from the eye.Full Answer >