Full Definition of COLLECTIVE. 1. 2. a: formed by collecting: aggregated b of a fruit: multiple. 3. a: of, relating to, or being a group of individuals. 4. : marked by similarity among or with the members of a group.5. : collectivized or characterized by collectivism.ull Definition of COLLECTIVE. 1. : a collective body: group. 2. : a cooperative unit or organization; specifically: collective farm. 3. : a helicopter control system governing lift. See collective defined for English-language learners.
Listen. The most common vision problems are refractive errors, more commonly known as nearsightedness, farsightedness, astigmatism and presbyopia. Refractive errors occur when the shape of the eye prevents light from focusing directly on the retina.ision occurs when light rays are bent (refracted) as they pass through the cornea and the lens. The light is then focused on the retina. The retina converts the light-rays into messages that are sent through the optic nerve to the brain. The brain interprets these messages into the images we see.
Ischemic Optic Neuropathy. A blockage may occur in the arteries of the optic nerve, a type of stroke in the eye called ischemic optic neuropathy. A person may experience mild to complete loss of vision as a result.Many cases of ischemic optic neuropathy occur as a result of temporal arteritis, a condition that doctors treat with corticosteroids.etinal arteries deliver blood to the eye, and if one of these arteries has a blockage, the nourishing blood will not reach the retina. This blockage may cause a severe, sudden loss of vision. If the eye has complete vision loss, this may mean the blockage occurred in a retinal artery near the optic nerve.