Ординатура / Офтальмология / Английские материалы / Essentials of Ophthalmic Lens Finishing, 2nd edition_Brooks_2003
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K E Y S E R I E S 6
Flat-Top Bifocals
TOTAL INSET AND DROP CONSIDERED INDEPENDENTLY
1.The segment line is 3 mm below the horizontal reference line.
2.The segment is exactly on the line.
3.The segment line is 2 mm below the horizontal reference line.
4.The segment line is 4 mm below the horizontal reference line. (Segment height is 17.5 mm.)
5.The segment line is 1 mm above the horizontal reference line. (Segment height is 22 mm.)
6.The segment line is 3.5 mm below the horizontal reference line.
7.The center of the bifocal segment line is 4 mm to the right of and 3 mm below the center of the marked cross.
8.The center of the bifocal segment line is 4 mm to the right of and 3 mm below the center of the marked cross.
9.The center of the bifocal segment line is 5 mm to the left of and 3 mm below the center of the marked cross.
10.The center of the bifocal segment line is 5.5 mm to the right of and 3 mm below the center of the marked cross.
11.The center of the bifocal segment line is 5 mm to the left of and 3 mm below the center of the marked cross.
12.The center of the bifocal segment line is 5 mm to the right of, and 3 mm below the center of, the marked cross.
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K E Y S E R I E S 7
Flat-Top Bifocals
TOTAL INSET AND DROP CONSIDERED SIMULTANEOUSLY
For problems 1 through 7, if the lens is marked as a right lens, the mark should be left- of-segment-center by an amount equal to the total insert and above the seg top by an amount equal to the segment drop. If the lens is marked as a left lens, the mark should be right-of-segment-center by an amount equal to the total insert and above the seg top by an amount equal to the segment drop.
8.The center of the bifocal segment line is 5 mm to the right of and 4 mm below the center of the marked cross.
9.The center of the bifocal segment line is 2.5 mm to the right of and 1 mm below the center of the marked cross.
10.The center of the bifocal segment line is 5 mm to the left of and 2 mm below the center of the marked cross.
11.The center of the bifocal segment line is 5.5 mm to the left of and 4 mm below the center of the marked cross.
12.The center of the bifocal segment line is 4.5 mm to the right of and 0.5 mm below the center of the marked cross.
13.The center of the bifocal segment line is 3 mm to the left of and 4.5 mm below the center of the marked cross.
14.The center of the bifocal segment line is 7 mm to the right of and 2 mm above the center of the marked cross.
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K E Y S E R I E S 8
Curve-Top Bifocals
1.Distance decentration = 4.5 mm Total inset = 6 mm
Segment drop = –4.5 mm
2.Distance decentration = 5 mm Total inset = 6 mm
Segment drop = –2.5 mm
3.Distance decentration = 3.5 mm Total inset = 5.5 mm
Segment drop = –5.5 mm
4.Distance decentration = 1.5 mm Total inset = 3.5 mm
Segment drop = 0 mm
5.Distance decentration = 4 mm Total inset = 5.5 mm
Segment drop = –3.5 mm
6.Distance decentration = 4.5 mm Total inset = 6 mm
Segment drop = –1.5 mm
7.Distance decentration = 2 mm Total inset = 4 mm
Segment raise = +1 mm
8.Distance decentration = 2 mm Total inset = 3.5 mm
Segment drop = –1.5 mm
9.Distance decentration = 3 mm Total inset = 5 mm
Segment drop = –4.5 mm
10.Distance decentration = 4.5 mm Total inset = 6 mm
Segment drop = –3 mm
11.Distance decentration = 5.5 mm Total inset = 6.5 mm
Segment drop = –2 mm
12.Distance decentration = 0.5 mm Total inset = 2 mm
Segment drop = –1.5 mm
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K E Y S E R I E S 9
Trifocal Lenses
1.Distance decentration = 0.5 mm Total inset = 1.5 mm
Segment raise = +1.5 mm
2.Distance decentration = 8.5 mm Total inset = 10 mm
Segment drop = –1 mm
3.Distance decentration = 6 mm Total inset = 7.5 mm
Segment drop = –4 mm
4.Distance decentration = 1.5 mm Total inset = 3.0 mm
Segment drop = –4.75 mm
5.Distance decentration = 2 mm Total inset = 3.5 mm
Segment raise = +1 mm
6.Distance decentration = 4.5 mm Total inset = 6 mm
Segment drop = –3 mm
7.Distance decentration = 3.5 mm Total inset = 4.5 mm
Segment drop = –4 mm
8.Distance decentration = 4.5 mm Total inset = 5.5 mm
Segment raise = +3.5 mm
9.Distance decentration = 6.5 mm Total inset = 8.0 mm
Segment drop = –4 mm
10.Distance decentration = 4 mm Total inset = 5 mm
Segment drop = –1.5 mm
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K E Y S E R I E S 1 0
Flat-Top Bifocals
RELATING MAJOR REFERENCE POINT AND SEGMENT POSITIONS
1.The center of the bifocal segment line is 6 mm to the right of and 1 mm below the center of the marked cross. The MRP is 4 mm to the right of the center of the marked cross.
2.The center of the bifocal segment line is 6 mm to the left of and 3 mm below the center of the marked cross. The MRP is 4 mm to the left of the center of the marked cross.
3.The center of the bifocal segment line is 5.5 mm to the right of and on the same level as the center of the marked cross. The MRP is 4 mm to the right of the center of the marked cross.
4.The center of the bifocal segment line is 6 mm to the right of and 4 mm below the center of the marked cross. The MRP is 5 mm to the right of the center of the marked cross.
5.The center of the bifocal segment line is 4.5 mm to the left of and 5.5 mm below the center of the marked cross. The MRP is 3 mm to the left of the center of the marked cross.
6.The center of the bifocal segment line is 6.5 mm to the right of and 4 mm below the center of the marked cross. The MRP is 5.5 mm to the right of the center of the marked cross.
7.The center of the bifocal segment line is 3 mm to the right of and 1 mm below the center of the marked cross. The MRP is 1.5 mm to the right of the center of the marked cross.
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K E Y S E R I E S 1 1
Round Bifocal Segment Lenses
1.Distance decentration = 3 mm Total inset = 4.5 mm
Segment drop = –4 mm
2.Distance decentration = 2.5 mm Total inset = 4.5 mm
Segment drop = –1 mm
3.Distance decentration = 2 mm Total inset = 3.5 mm
Segment drop = 0 mm
4.Distance decentration = 4 mm Total inset = 5.5 mm
Segment drop = –6.5 mm
5.Distance decentration = 4 mm Total inset = 6 mm
Segment drop = –0.5 mm
6.Distance decentration = 2.5 mm Total inset = 4 mm
Segment drop = –3 mm
7.Distance decentration = 3 mm Total inset = 4.5 mm
Segment drop = –3.5 mm
8.Distance decentration = 3.5 mm Total inset = 5 mm
Segment drop = –4.5 mm
9.Distance decentration = 5 mm Total inset = 7 mm
Segment drop = 0 mm
10.Distance decentration = 4 mm Total inset = 6 mm
Segment drop = –5 mm
11.Distance decentration = 3 mm Total inset = 5 mm
Segment drop = –3 mm
12.Distance decentration = 5.5 mm Total inset = 6.5 mm
Segment drop = –6.75 mm
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K E Y S E R I E S 1 2
Franklin-Style Bifocals
1.Distance decentration = 3.5 mm Segment drop = –2 mm
2.Distance decentration = 6.5 mm Segment raise = +3.5 mm
3.Distance decentration = 4 mm Segment drop = –3 mm
4.Distance decentration = 2.5 mm Segment drop = –6.5 mm
5.Distance decentration = 3.5 mm Segment drop = –1 mm
6.Distance decentration = 3.5 mm Segment drop = –5.5 mm
7.Distance decentration = 4.5 mm Segment drop = –5 mm
8.Distance decentration = 2 mm Segment drop = –5 mm
9.Distance decentration = 0 mm Segment drop = –3 mm
10.Distance decentration = 4 mm Segment drop = –7.5 mm
11.Distance decentration = 0 mm Segment drop = –8.5 mm
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K E Y S E R I E S 1 3
Centration Using Irregular Patterns
1.When viewed from the front of the lens, the center lensmeter dot is 3 mm below and 5 mm to the right of the marked cross.
2.When viewed from the front of the lens, the center lensmeter dot is 1 mm below and 2 mm to the left of the marked cross.
3.When viewed from the front of the lens, the center lensmeter dot is 0.5 mm below and 4.5 mm to the left of the marked cross.
4.When viewed from the front of the lens, the center lensmeter dot is 1.5 mm above and 3.5 mm to the right of the marked cross.
5.When viewed from the front of the lens, the center lensmeter dot is 2 mm above and 8 mm to the right of the marked cross.
6.When viewed from the front of the lens, the center lensmeter dot is 2 mm to the left of the marked cross.
7.When viewed from the front of the lens, the center lensmeter dot is 2 mm to the left of the marked cross.
8.When viewed from the front of the lens, the marked cross is 4.5 mm to the left of and 4 mm above the center of the bifocal segment line.
9.When viewed from the front of the lens, the center lensmeter dot is 0.5 mm above and 4.5 mm to the left of the marked cross.
10.When viewed from the front of the lens, the marked cross is 9 mm to the right of and 7 mm above the center of the bifocal segment line.
11.When viewed from the front of the lens, the marked cross is 4.5 mm to the left of and 2.5 mm above the center of the bifocal segment line.
