Biomedical Engineering Reference
In-Depth Information
A
-2.00 D
F
A
= +2.00 D
NPA
-50.00 cm
0.00 D
B
-4.00 D
F
A
= +2.00 D
NPA
FP
-25.00 cm
-2.00 D
-50.00 cm
C
0.00 D
F
A
= +2.00 D
FP
+2.00 D
∞
+50.00 cm
Figure 8-8.
A.
For an emmetropic eye that has an amplitude of accommodation of
2.00 D, the near point of accommodation (NPA) is 50.00 cm.
B.
For an uncorrected
2.00 D myopic with the same amplitude, the NPA is 25.00 cm.
C.
A 2.00 D uncorrected
hyperopic eye with the same amplitude has an NPA at infinity.
