About.com suggests that blind spots have an explanation rather than a function. The explanation is that the part of the eye that the optic nerve exits from does not have rods or cones, thus resulting in a blind spot. Scholarpedia states that blind spots are present only in vertebrates because eyes in vertebrates develop from the brains, as compared to cephalopods, whose eyes develop from the skin and therefore have no blind spots.Know More
Scholarpedia goes on to say that there are a couple of hypotheses on why people do not notice their blind spots, also known as scotomas. The first hypothesis is that the brain fills in these blind regions, which suggests that both memory and imagination affect vision. This filling-in theory postulates that the brain adds objects, patterns and colors to the blind spot. The second hypothesis is that the brain merely ignores the blind spots.
However, Reference.com points out that blind spots beyond those found normally in every eye may be a sign of retinal disease. These pathological scotomata can be any shape or size. If they occur in the periphery of the field of vision, they are more likely to be ignored or to go unnoticed. Diseases that cause this include multiple sclerosis and tumors on the pituitary gland.Learn more about Human Anatomy
To install a blind spot mirror, simply attach it to the existing mirror or rear-view mirror at the proper height and angle. To simplify the process, choose a mirror that has adhesive on the back of the mirror.Full Answer >
The cornea's primary function is to focus and control the entrance of light into the eye. It is a vital part of the eye and acts as the eye's outermost lens.Full Answer >
A joint's function is to bear weight, perform work and exhibit a particular range of motion during movement where two or more bones come together for the purpose of movement. A joint moves when the muscles crossing it contract.Full Answer >
The function of the glottis is to make several voicing sounds between the vocal folds when they vibrate. Voiceless consonants include the English h, f, s, p, t and k sounds. The glottis functions when vocal folds are narrowed yet apart, according to Healthline.Full Answer >