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.Know More
The Merck Manual Home Health Handbook describes the sclera as the eye's tough, outer covering. It is transparent, allowing light to pass through. Next, light passes through the cornea. The cornea roughly focuses light towards the pupil. The pupil is a dark circle in the center of the eyeball. It is surrounded by the iris, which constricts and expands to change the size of the pupil. Acting similarly to a camera's aperture, it regulates the amount of light that enters the eye's interior.
After entering the pupil, that light passes through the lens. The lens is responsible for fine focusing light. It does this by slightly altering its shape to bend light rays at the correct angles. The light then lands on the retina, which is a surface at the back of the eye that is covered in photoreceptors. Photoreceptors sense different types and wavelengths of light that are converted into electrical signals. The optic nerve delivers these signals to the brain where they are decoded into images, notes The Merck Manual Home Health Handbook.Learn More
Primary open-angle glaucoma, one of the most prevalent forms of the condition, shows virtually no symptoms in the early stages, according to Mayo Clinic. This is why it is important to have a routine eye exam so glaucoma can be detected and treated.Full Answer >
The main function of the eye is to convert light into electrochemical impulses that the brain can interpret as visual images. The various parts of the eye perform different functions that contribute to this purpose.Full Answer >
Because the natural color of the eye isn't uniform, some color contacts have tiny dots and lines of color rather than a uniform tint. These patterns of color on the contact are intended to mimic the appearance of a real eye and make the final eye color look more natural.Full Answer >
The use of FDA-approved femtosecond lasers is considered the best surgical procedure for removing cataracts, states All About Vision. These are deemed better than traditional methods — phacoemulsification and extracapsular extraction — having improved the precision during certain steps and reduced the use of surgical blades and other handheld tools.Full Answer >