ODP Spectacle Final Exam Study Material - Full Answer Key Verified

ODP Spectacle Final Exam Study Material - Full Answer Key Verified Why would an optician split prism? - answer - To achieve a more balanced appearance. The front curve of a lens is +7.00, the back curves of this lens are -3.00 and -4.00. What are the true powers? - answer - +4.00 and +3.00 What is the relationship between diopter and focal length? - answer - When one increases, the other decreases. Donating to the Lion's Club is an example of: - answer - Waste management A patient's PD was mistakenly noted to be 62 mm when the actual measurement is 66 mm. If the power of the lenses are -2.00 diopters in each eye, how much prism will be induced in the finished spectacles and in which direction is the base? - answer - 0.8 total BO What is the power of a lens that has a focal length of 50 cm? - answer - 2.00 D To test a lens using the drop ball test, what is commonly used? - answer - A 5/8-inch steel ball When is vertex distance compensation mandatory? - answer - For a spectacle lens Rx over +/-7.00 diopters A lens has a base curve that has a focal length of 40 inches, and an ocular curve with a focal length of 10 inches. What is the diopter power of this lens? - answer - -3.00 What are the true powers of this prescription? -5.00 -0.50 x 90 - answer - -5.00 @ 090 and -5.50 @ 180 An elderly lady can no longer read her favorite mystery novels with ease. What is an added value step to take for this patient? - answer - Demonstrate a floor stand type of magnifier that will allow enlarged viewing while making it easy to turn the pages. What will surround and hold lenses in place? - answer - The eyewire Using the Rule of Thumb corrected base curve theory, what would be the base curve for a +2.00 -1.00 x 180 lens? - answer - +6.00 *When measuring a frame to determine lens MBS, what is possible? - answer - ED could be diagonal How will moving a -5.00 diopter lens 10.00 mm closer to the eye affect the patient? - answer - The lens will be 0.50 D too strong and the patient may experience undefined discomfort What is shrikage? - answer - Inventory that is not accounted for physically, but shows up in the inventory report What entity regulates the use and disclosure of private health information? - answer - HIPPA This is the "B" measurement: - answer - Vertical measurement of box enclosing lens area Which will have the most reflection, a lens with the index of? - answer - 1.71 What do the initials HEV stand for? - answer - High energy visable What measurement is located at approximately 40 centimeters, or 16 to 18 inches? - answer - Reading vision What material has an index of 1.523? - answer - Crown glass Give the simple definition of a bridge? - answer - Connects the two eye wires Which refractive error results in part of the image in front of the retina and part behind the retina? - answer - Mixed astigmatism What should be part of the eyewear dispensing process? - answer - Inviting the patient back for adjustments and repairs DBL is mostly correctly defined as: - answer - Distance between lenses What type of optical material will disperse light? - answer - All materials with non-parallel sides Define FVD: - answer - Fitted vertex distance A 5 year old child has been prescribed his first eyeglasses prescription. The prescription is +5.00 OU. What is one piece of advice the optician can give to the child's parents? - answer - The child will likely show signs of adapting to the prescription such as wanting to take them off in the beginning. How far will a 1 diopter prism displace an image? - answer - 1 cm Calculate vertical decentation of a bifocal when the frame has a B measurement of 50mm and a segment height of 28mm. - answer - 3 mm up To what index is the lens clock calibrated? - answer - 1.530 What is true about a biconcave lens? - answer - It has a minus power base curve Which of the following should be avoided when cleaning a Zyl frame? - answer - Acetone The eyelashes are ultra sensitive to touch and