OCPP 102 2.3 UPDATED ACTUAL Questions and CORRECT Answers
1. accommodation Varialbe focusing ability provided by the crystalline lens and related intraocular
muscles.
2. at rest, flexes When the eye focuses on distant objects, the lens is . But when summoned
to focus upon an object at less than 20 feet, the crystalline lens to provide
additional plus power.
3. plus power In order to accommodate, the lens has to supply additional what?
4. 15 diopters At birth the lens is very flexible and has about how much accommodation?
5. 5 centimeters ( If all is diopters of accommodation from birth are used, the eye would focus where?
about 2 inches)
6. lens capsule capsule (bag) that encloses the crystalline lens
7. more dense Because of the lens capsule, multiplying cells aren't washed away. This causes the
lens to become .
8. near point the closest distance at which an eye can focus
9. 84% What percent of the US population over age 55 needs eyeglasses?
10. Benjamin Credited with the concept of correcting presbyopia with bifocal lenses.
Franklin
11. August Morck Invented cement bifocals, patented in 1888
12. Cemented Kryp- Bifocal invented by John Borsch in 1899. Patented technique of using high index
tok Bifocal flint glass bifocal segment cemented into a ground countersink curve on the carrier
lens with Canada balsam cement.
13. Kryptok bifocal Developed in 1908 by John Borsch, improved bifocal type that used a high index
flint glass segment and a countersink curve in the distance carrier, which are fused
together instead of cemented.
, 14. Chromatic abber- Disadvantage of using Kryptok bifocal lenses:
ation
15. Nathan Stanley Patented the D style segment bifocals that is popular today in the US.
16. fused glass Until plastic became a popular lens choice in the 1970's, what was used for the
standard bifocal construction type?
17. John Isaac Credited with the invention of the trifocal in 1826.
Hawkins
18. Virgil Hancock Awarded patent for rounded top trifocal design in 1932.
19. Virgil Hancock Developed first fused straight-top trifocal in 1936.
20. image jump The sudden displacement of an image as the bifocal line is crossed by the eye
21. the technology to Why did it take so long for progressive addition lenses to be created?
make them was
not available
22. radius of curva- In order to increase plus power through out a PAL, the must become
ture continually shorter.
23. steeper, plus In PALs, shortening the radii produce an increasingly surface, which
power provides the progressive .
24. distance, inter- 3 zones of a PAL
mediate, near
25. curvature, index In order to create progressive power, either the lens or its must
of refraction change gradually over the surface of the lens.
26. surface curvature All current PALs obtain their progressive power by changing .
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1. accommodation Varialbe focusing ability provided by the crystalline lens and related intraocular
muscles.
2. at rest, flexes When the eye focuses on distant objects, the lens is . But when summoned
to focus upon an object at less than 20 feet, the crystalline lens to provide
additional plus power.
3. plus power In order to accommodate, the lens has to supply additional what?
4. 15 diopters At birth the lens is very flexible and has about how much accommodation?
5. 5 centimeters ( If all is diopters of accommodation from birth are used, the eye would focus where?
about 2 inches)
6. lens capsule capsule (bag) that encloses the crystalline lens
7. more dense Because of the lens capsule, multiplying cells aren't washed away. This causes the
lens to become .
8. near point the closest distance at which an eye can focus
9. 84% What percent of the US population over age 55 needs eyeglasses?
10. Benjamin Credited with the concept of correcting presbyopia with bifocal lenses.
Franklin
11. August Morck Invented cement bifocals, patented in 1888
12. Cemented Kryp- Bifocal invented by John Borsch in 1899. Patented technique of using high index
tok Bifocal flint glass bifocal segment cemented into a ground countersink curve on the carrier
lens with Canada balsam cement.
13. Kryptok bifocal Developed in 1908 by John Borsch, improved bifocal type that used a high index
flint glass segment and a countersink curve in the distance carrier, which are fused
together instead of cemented.
, 14. Chromatic abber- Disadvantage of using Kryptok bifocal lenses:
ation
15. Nathan Stanley Patented the D style segment bifocals that is popular today in the US.
16. fused glass Until plastic became a popular lens choice in the 1970's, what was used for the
standard bifocal construction type?
17. John Isaac Credited with the invention of the trifocal in 1826.
Hawkins
18. Virgil Hancock Awarded patent for rounded top trifocal design in 1932.
19. Virgil Hancock Developed first fused straight-top trifocal in 1936.
20. image jump The sudden displacement of an image as the bifocal line is crossed by the eye
21. the technology to Why did it take so long for progressive addition lenses to be created?
make them was
not available
22. radius of curva- In order to increase plus power through out a PAL, the must become
ture continually shorter.
23. steeper, plus In PALs, shortening the radii produce an increasingly surface, which
power provides the progressive .
24. distance, inter- 3 zones of a PAL
mediate, near
25. curvature, index In order to create progressive power, either the lens or its must
of refraction change gradually over the surface of the lens.
26. surface curvature All current PALs obtain their progressive power by changing .
2/7
