ABO (NOCE) Practice Word Scramble
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| Question | Answer |
| What is the index of rafraction for CR-39 plastic? | 1.498 |
| What is the index of refraction of Crown Glass? | 1.52 |
| What is the Abbe number of Cr-39? | 58 |
| What is the specific gravity of Crown Glass? | 2.54 |
| What is the specific gravity of CR-39? | 1.32 |
| What is the Abbe number for Crown Glass? | 58 |
| What is the index of refraction for Polycarbonate? | 1.59 |
| What is the specific gravity of Polycarbonate? | 1.20 |
| What is the Abbe number for Polycarbonate? | 31 |
| What does Aspheric mean in the optical world? | non-spherical |
| Bicentric grinding or "____ ___" is one way to correct for vertical imbalance | slab off |
| "____________ ____ ___" is always ground base up on the lens with the most minus or at least plus power in the 90 degree meridian. | Conventional Slab Off |
| What does "PD" stand for? | Pupillary Distance |
| The average person's eyes will converge _ to _ mm inward to read | 3 to 6 |
| "_________ __" is the distance from the center of the bridge of the nose to the center of each pupil. The right eye is recorded first then the left eye. (example: 33/34) | Monocular PD |
| What does OCHt stand for? | Optical Center Height |
| Bifocals and Trifocals need _______ height. | segment |
| Progressives lenses need _________ OCHt | monocular |
| "_______ ______" is measured from the lower eyelid to the deepest B portion of the eye wire. | Segment Height |
| "_____ _______" bend down behind the ear and follow the contour of the skull, resting evenly against it. | Skull Temples |
| "_______ _______" generally straight and hold the spectacles on primarily by pressure against the side of the head. | Library Temples |
| "______ ___ _______" curve around the ear and extend to the level of the ear lobe. They are often used in both children's frames and safety eyewear. | Riding Bow Temples |
| "___________ _______" can be used either as library or skull temples depending on the manner in which they are bent. | Convertible Temples |
| An imaginary line is drawn through the middle of the eyewire both in the horizontal and vertical planes. What is the name of this process? | The Datum System |
| An imaginary box is drawn around the are to be measure. What is the name of this process? | The Box System |
| Horizontal measurement of the box enclosing lens area, also known as the eye size. What is the name of this measurement? | A |
| The least distance between the two lenses. This is known as the... | DBL |
| Vertical measurement of the box enclosing lens area. What is the name of this measurement? | B |
| The difference between the horizontal and vertical measurements is known as the... | Frame Difference |
| Twice the distance from the geometrical center of the lens to the bevel farthest away from it. This is known as the... | Effective Diameter |
| The width of the lens along the central datum line. This is known as what measurement? | C |
| The measurement from the center of the barrel to the middle of the bend is called the ______ __ ____. | length to bend |
| The amount of ____________ required in each eyeis equal to the (GCD - PD)/2 | decentration |
| It is necessary to calculate ________ ____________ when determining where the line or fitting cross of a multifocal lens is positioned relative to the datum line of the frame. | vertical decentration |
| Name this frame material: Epoxy material. Light in weight, cannot be overheated or burned and will not shrink. | Optyl |
| Name this frame material: Originally the most used material for frames, it is a cotton/wood flak product and can be produced in a great variety of colors, textures and patterns. | Zyl |
| Name this frame material: Synthetic material made from coal, water and air. Light in weight and very strong. Often used in childrens frames. | Nylon |
| What are the two types of materials frame are made of? | Metal and Plastic |
| Name this frame material: Noncorrosive, strong and light in weight. Often used in temples. | Stainless Steel |
| Name this frame material: Light in weight, long lasting, may be anodized allowing for many variations in color. | Aluminum |
| This face shape can wear most frames well. | Oval |
| This face shape should wear relatively narrow frames preferably with high temple attachments. | Round |
| This face shape should wear a deep frame, preferably with low temple attachments. | Oblong |
| For ___________ wearers: Frames with adjustable nose pads or minimal vertex distance. Slight face form and avoid radical nasal cutaways. | progressive |
| For ________: Safety is the first and foremost consideration. A well fit bridge and spring hinges for flexibility. | children |
| For ______: Lenses must be 3.00mm thick. "Z87" markings on each temple and the frame front. | safety |
| A well fit frame will come in contact with the wearer only at the following three points known as the _______ ________ | fitting triangle |
| There should be 8-10 degrees of ___________ ____ for most frames. | pantoscopic tilt |
| Less commonly, when the pupil is positioned directly behind the optical center, an ___________ ____ is recommended. | orthoscopic tilt |
| In the very unusual situation where the pupil is positioned below the optical center of the lens, a ___________ ____ is called for. | retroscopic tilt |
| Most frames will have some ________ face form. | positive |
| The need to apply ________ face form can usually be avoided with more appropriate frame selection. | negative |
| Left lens is farther out - Bend left end piece ___ | out |
| Left lens is farther in - Bend left end piece ___ | in |
| Increase pantoscopic angle - Bend both temples or end pieces ___ | down |
| Decrease pantoscopic angle - Bned both temples or end pieces ___ | up |
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