Visual perception definition5/20/2023 Objects that are far away appear blurry, while those that are close are clear. The eyeball is too long or the cornea has too much curvature, causing light entering the eye to not focus correctly. Symptoms may also include difficulty concentrating on work that is close, eye strain, headaches, fatigue, aching or burning eyes, or irritability after sustained concentration.Ĭorrectable with glasses, contact lenses. Objects that are close to the eye appear blurry, while those that are far away are clear. The eyeball is too short or the cornea is too flat, causing light entering the eye to not focus correctly. Visual acuity is the highest in the fovea.Ĭonditions that May Lead to Visual Impairment Fovea: the center of the field of vision, located in a small depression in the retina.Macula: the functional center of the retina.There are no visual receptors on the optic disc. Optic Disc: the raised disc on the retina located where the optic nerve connects.Retina: the inner layer of tissue of the eye that creates a focused image and sends it to the brain.The FUNDUS aka the Posterior chamber of the eye is the interior surface, opposite of the lens, includes the retina, optic disc, macula, and fovea. Vitreous humor: a clear fluid that fills the space between the lens and the retina. ![]() Ciliary body: an extension of the iris that produces vitreous humor.Lens: the clear part behind the pupil that focuses light.Pupil: the dark part of the eye that allows light in to reach the lens.Cornea: the clear front surface of the eye.Iris: colored part of the eye that adjusts the size of the pupil.Rods – responsible for night and black/white vision, peripheral visionĬones- responsible for color, fine detail, central vision (the MACULA has the highest concentration of cones)Īnterior Chamber- 7 parts of the anterior chamber/segment of the eye The following charts review the anatomy of the eye and the more common conditions that can lead to visual impairment, as well as the roles of health care professionals in the treatment of low vision and therapeutic interventions for low vision.
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