Potec PDR-7000 - VA Conversion Table; Preset Addition Power

PDR-7000 Operation Manual
7.2 VA Conversion Table
Decimal Fraction(feet) Fraction(meters)
0.05 20/400 6/120
0.1 20/200 6/60
0.15 20/150 6/45
0.2 20/100 6/30
0.25 20/80 6/24
- 20/70 6/21
0.32 20/60 6/18
0.4 20/50 6/15
0.5 20/40 6/12
0.63 20/30 6/9
0.8 20/25 6/7.5
1.0 20/20 6/6
- 20/15 6/4.5
2 20/20 6/3
7.3 Preset Addition Power
The preset addition (ADD) powers are lower than the expected ones corresponding
to the patient’s age by increments of three (0.75 D).
Age Near Addition(Dptr) Age Near Addition(Dptr)
~42 0.25 up to 56 2.00
~44 0.50 up to 60 or later 2.50
~48 1.00
~52 1.50
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