EYES

• are sensory organs responsible for vision Eyes
• % of all sensory information reaches the brain through the eyes 70%
• located in the orbital cavities of the skull eye
• 3 layers of the eye 1. Schlera 2. Choroid 3. Retina
• outermost layer that helps maintain shape of the eye sclera
• clear, transparent part of schlera considered window of the eye allow light to enter and refracts the light rays entering the eye cornea
• maintains blood supply to the eye choroid
• maintains the placement of the retina and the eyeballs spherical shape vitreous humor
• refracts light rays entering the eye cornea
• permits light to enter the eyes pupil
• refracts and focuses light into the retina lens
• receives visual stimuli and transmits images to the brain for processing retina
• maintains the eye and shape schlera
• an eye chart used in testing near vision acuity jaeger test
• the ability to discern letters or numbers at a given distance the snellen chart
• a card which paragraphs of text are printed jaeger test
• nearsightedness myopia
• farsightedness hyperopia
• farsightedness due to aging presbyopia
• "also known as the ""Tumbling E"" Eye chart" snellen e chart
• useful to test the distance visual acuity of children or adults who cannot communicate verbally due to physical/ mental disability, languang barrier or other reasons snellen e chart
• consists of a seven card with each card containing a single picture allen card test
• task is to match and point out the dustance target LEA Symbols Test
• the mucous membrane that covers the front of the eye and lines the inside of the eyelids conjuctiva
• everted eyelashes ectropion
• ptosis of both eyelids myasthenia gravis
• enlargement if meibomian gland chalazion
• caused by an infection hordeolum/stye
• normal acuity 20/20
• better vision 20/15
• legally blind 20/200
• red palpebral and bulbar conjuctiva conjunctivitis
• pale pink conjuctiva anemia
• growth or thickening of conjunctiva from inner canthal area toward iris pterygium or pinguecula
• eye injury subjunctival hemorrhage
• benign pigmented congenital discoloration nevus
• vit A deficiency; infection may be accompanied by HYPOPION (pus in anterior chamber) cloudy cornea
• roughness and irregularities of cornea corneal abrasions and ulcers
• yellow ring in outer margin WILSON's disease, increased copper absorption Kayse-Fleischer Ring
• appears grayish white, usually due to an okd injury or inflammation corneak scar