Ncle Study Guide 2024 With Complete Solutions!

Patient Selection - ANSWER-13-38yo; WM; R.E +/-1.50D; K reading 41.00-46.00; Butʻs 15 secs; Cornea with no significant and sequential staining, Good tear flow by Schrimer test, Regular corneas- no scarring or distortion of corneal mires, regular low astigmatism +1.50, Good lid position with no scleral show, Adequate manual dexterity. Cornea - ANSWER-1) Helps shield the from dust, germs and other harmful matters. Shares this protective task from eyelid, eye sockets, and sclera. 2) Window that controls and focuses the entry of light. Epithelium - ANSWER-Outermost layer, 10% of tissueʻs thickness, blocks foreign materials and provides a smooth surface that absorbs oxygen cell nutrients from tears, distributes nutrients to the rest of the cornea, sensitive to pain (rubbed/scratched) due to nerve endings. Bowmanʻs Membrane - ANSWER-acellular, provides strength, no regenerative properties, scarring can occur. Stroma - ANSWER-90% of corneaʻs thickness, 78% water and 16% collagen (strength, elasticity, and form) NO blood vessels. Descementʻs Membrane - ANSWER-thin and strong and acts as a protective barrier against infection and injuries. Contains collagen fiber and made by endothelial cells Endothelium - ANSWER-Single layer of flattened cells, susceptible to trauma and pathology, very rarely regenerative Eyelids Palpebra - ANSWER-Protects anterior surface of eye from injury, Aids in regulation of light reaching eye. Distributes protective tear film over the cornea when blinking Glycolcolax layer - ANSWER-Innermost layer of tear film, consists of carbs and conjunctival epithelia.