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.
If you have sudden blurry vision in one eye and are over 60, you may have developed a macular hole in the part of the retina where fine focusing occurs. Blurry vision also may be a symptom of a detached retina, eye herpes or optic neuritis (inflammation of the optic nerve), among other causes. Certain eye conditions and diseases can cause permanent loss of vision, so it's important to visit your eye care practitioner for diagnosis and prompt treatment.