Q&A Chapters 4 & 5 Lens Material and Frames
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| show | 1.498
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| What is the index of refraction of Crown Glass? | show 🗑
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| What is the Abbe number of Cr-39? | show 🗑
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| What is the specific gravity of Crown Glass? | show 🗑
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| show | 1.32
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| show | 58
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| show | 1.59
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| show | 1.20
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| show | 31
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| What does Aspheric mean in the optical world? | show 🗑
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| show | slab off
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| "____________ ____ ___" is always ground base up on the lens with the most minus or at least plus power in the 90 degree meridian. | show 🗑
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| What does "PD" stand for? | show 🗑
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| The average person's eyes will converge _ to _ mm inward to read | show 🗑
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| "_________ __" 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) | show 🗑
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| What does OCHt stand for? | show 🗑
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| show | segment
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| Progressives lenses need _________ OCHt | show 🗑
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| "_______ ______" is measured from the lower eyelid to the deepest B portion of the eye wire. | show 🗑
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| show | Skull Temples
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| "_______ _______" generally straight and hold the spectacles on primarily by pressure against the side of the head. | show 🗑
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| "______ ___ _______" 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. | show 🗑
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| "___________ _______" can be used either as library or skull temples depending on the manner in which they are bent. | show 🗑
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| show | The Datum System
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| An imaginary box is drawn around the are to be measure. What is the name of this process? | show 🗑
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| Horizontal measurement of the box enclosing lens area, also known as the eye size. What is the name of this measurement? | show 🗑
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| The least distance between the two lenses. This is known as the... | show 🗑
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| show | B
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| The difference between the horizontal and vertical measurements is known as the... | show 🗑
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| Twice the distance from the geometrical center of the lens to the bevel farthest away from it. This is known as the... | show 🗑
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| The width of the lens along the central datum line. This is known as what measurement? | show 🗑
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| The measurement from the center of the barrel to the middle of the bend is called the ______ __ ____. | show 🗑
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| show | decentration
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| show | vertical decentration
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| Name this frame material: Epoxy material. Light in weight, cannot be overheated or burned and will not shrink. | show 🗑
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| show | Zyl
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| show | Nylon
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| show | Metal and Plastic
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| show | Stainless Steel
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| show | Aluminum
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| show | Oval
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| This face shape should wear relatively narrow frames preferably with high temple attachments. | show 🗑
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| show | Oblong
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| show | progressive
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| show | children
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| For ______: Lenses must be 3.00mm thick. "Z87" markings on each temple and the frame front. | show 🗑
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| show | fitting triangle
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| There should be 8-10 degrees of ___________ ____ for most frames. | show 🗑
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| show | orthoscopic tilt
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| show | retroscopic tilt
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| Most frames will have some ________ face form. | show 🗑
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| show | negative
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| show | out
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| show | in
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| Increase pantoscopic angle - Bend both temples or end pieces ___ | show 🗑
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| Decrease pantoscopic angle - Bned both temples or end pieces ___ | show 🗑
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