Biomedical Engineering Reference
In-Depth Information
A
0.00 D
+60.00 D
n
= 1.000
n
′
= 1.333
+60.00 D
+22.22 mm
+23.22 mm
B
-2.59 D
+60.00 D
n
= 1.000
n
= 1.333
′
FP
+57.41 D
+23.22 mm
-38.61 cm
Figure 7-3.
A.
In myopia, an infinitely distant object is imaged anterior to the retina.
B.
The far point of the eye (FP) is conjugate with the retina, meaning that an object
located at the far point is imaged on the retina. Object vergence and eye power are
given at the top of the refracting surface and image vergence at the bottom. See text
for further details. [Note that object distance (
−
38.61 cm) is given in centimeters and
image distance (
+
23.22 mm) in millimeters.]
an axial length of 23.22 mm and the rays that form the image exist in aqueous, the
image vergence must be
5
n
′
l
′
′
=
L
(1000)(1.333)
L
′
=
23.22 mm
′
L
=
+
57.41 D
5. We have placed a factor of 1000 in the numerator because we are keeping the axial length in millimeters.
