COT- CERTIFIED OPHTHALMIC TECHNICIANS EXAM () QUESTION WITH COMPLETE SOLUTION

COT- CERTIFIED OPHTHALMIC TECHNICIANS EXAM () QUESTION WITH COMPLETE SOLUTION Informed Consent Form - ANSWER-The patient signs this prior to surgery; it outlines the procedure and the RBAs Thyroid Disease - ANSWER-The systemic disease associated with eye findings referred to as Graves' Disease Diabetic Retinopathy - ANSWER-Disease which is indicated by the presence of microaneurysms, dot/blot hemes, and lipid exudates from a leakage of the retinal vessels Epinephrine/Intravenous Cortisone/Benadryl - ANSWER-Medications that should be kept on hand in case of severe allergic reaction to a drug Metal Test Spheres - ANSWER-Provided by the manufacturer, with known radius of curvature, to be used for the calibration of the manual keratometer 40 Dioptres - ANSWER-The highest range for Fresnel press-on prism 10 Dioptres (each lens) - ANSWER-The highest range for ground-in prism Prentice's Rule - ANSWER-Formula for calculating prismatic effect induced at any point in the lens Prince Rule - ANSWER-Measures near point of accommodation - position closest to eye where small object can be kept in sharp focus by maximal accommodation. Also measures bifocal power Snell's Law - ANSWER-Determines the index of refraction: speed of light in air/speed of light through the substance Prism Displacement Formula - ANSWER-P=C/D Refractive Index of Crown Glass - ANSWER-1.523 Compound Myopic Astigmatism (CMA) - ANSWER-Represented by minus spherical and minus cylindrical lenses Clinical Definition of Infinity - ANSWER-20 feet (6 meters) and beyond Punctum Dilator/Lacrimal Needle or Probe - ANSWER-Instruments used for lacrimal irrigation Electrolysis - ANSWER-Procedure which treats trichiasis Argon/Blue-Green Light Laser - ANSWER-Laser which is used to coagulate blood or seal off blood vessels Endophthalmitis - ANSWER-Ocular emergency following cataract surgery when a patient presents with symptoms of a painful red eye and decreased vision within the first week Trabeculectomy - ANSWER-Glaucoma surgery that permits aqueous to filter out of the anterior chamber and form a conjunctival bleb Enucleation - ANSWER-Total removal of the eye globe Evisceration - ANSWER-Removal of the contents of the eye, leaving the outer shell with the muscles attached Physiologic Blind Spot - ANSWER-15 degrees Temporal to Fixation 1,000 Apostilbs or 1430 Lumens - ANSWER-Light meter readings for calibrating a Goldmann perimeter Red Colour Stimulus - ANSWER-Used on an automated perimeter test for detecting macular defects Blue Colour Stimulus on Yellow Background - ANSWER-Used for earlier detection of visual field loss Amsler Grid Visual Field - ANSWER-Central 20 degrees (or 10 degrees from fixation) Tubular/Spiral Visual Field Defects - ANSWER-Indicated in hysterical patients Binocular Visual Field - ANSWER-Extends 120 degrees Bitemporal Hemianopsia (optic chiasm) - ANSWER-A lesion at the optic chiasm, may involve only fibres crossing over to the opposite side. Since these fibres originate in the nasal half of each retina, visual loss involves the temporal half of each field. May be caused by a tumour. Bjerrum's (arcuate) Scotoma - ANSWER-Complete nerve fiber bundle defect emanating from the blind spot, arching over or under the macula and ending on the nasal horizontal line Gram & Giemsa Staining - ANSWER-Dye procedures used to detect and classify bacteria Staphylococcus Aureus - ANSWER-Gram positive bacterium that frequently causes blepharitis, conjunctivitis, and infectious keratitis Pseudomonas Aeruginosa - ANSWER-Gram-negative organism associated with contact lens overwear Herpes Simplex Virus Type 1 - ANSWER-transient viral vesicles that infect the facial area Acanthamoeba - ANSWER-Protozoan which can be found in homemade contact lens solutions and can cause painful infections of the cornea DK Value - ANSWER-a measure of the oxygen permeability through a given material where D is the diffusion coefficient for oxygen movement in the lens material and K is the solubility of oxygen in this material. Cobalt/UV Filter - ANSWER-Slit lamp filter used in conjunction with fluorescein to evaluate fluorescein patterns with rigid and silicon hydrogel contact lenses