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.Know More
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 about Vision
Lens implants are prosthetic devices embedded in the human eye following surgical removal of the eye's natural lens due to the presence of cataracts. Generally referred to as intraocular lenses, or IOLs, these synthetic implants cause marked improvements in the visual acuity of cataract patients, states the American Academy of Ophthalmology's EyeSmart.Full Answer >
According to the Eye Care Office of Ofner, Neale and Fleming, cataracts of the eye create a clouding of the lens inside the eye, behind the pupil or iris (the colored portion of the eye), that is often mistaken for a film over the eye. Cataracts are a common aspect to the aging process. Early signs of cataracts include decreased distance vision and decreased vision while reading.Full Answer >
Intraocular pressure refers to the tissue pressure within the human eye and is typically caused by the continual drainage and production of aqueous humors, states MedicineNet. The eye pressure is usually shown as millimeters of mercury (mm Hg).Full Answer >
The amount of light entering the human eye is regulated by the diameter of the pupil. The pupil is the dark spot at the center of a healthy iris that, according to the National Institutes of Health, rests immediately in front of the eye's lens.Full Answer >