REVISION 1 : SCHEMATIC EYE
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1
REVISION
SCHEMATIC EYE
2
SCHEMATIC EYE
mathematical or physical model that represents the basic optical features of the real eye
3
Optical Fact of Cornea
Cornea is steep at the centre, flattens towards periphery.
Corneal power reduced towards periphery.
Mean radius of anterior corneal surface = 7.8 mm
Mean radius of posterior corneal surface = 6.7 mm
Corneal central thickness approximately 0.5 mm.
Corneal index = 1.376
4
Multiple Choice
Calculate the power for the anterior cornea.
n air = 1
n cornea = 1.376
r anterior = 8.7 mm
48.2 D
46.8 D
50.2 D
52.4 D
5
Multiple Choice
Calculate the posterior cornea.
n cornea = 1.376
n aqeous = 1.336
r posterior = 6.7 mm
- 5.97 D
- 6.00 D
- 6.25 D
- 7.00 D
6
Multiple Choice
Calculate total power for the cornea.
42.00 D
42.25 D
43.00 D
43.25 D
7
Optical Fact of Crystalline Lens
n at core or nucleus = 1.41
n at less dense cortex = 1.38
Anterior radii of curvature = +10mm
Posterior radii of curvature = - 6mm
8
Multiple Choice
Calculate the anterior crystalline lens power.
n aq = 1.336
n lens = 1.41
r1 = 10mm
r2 = - 6mm
7.00 D
7.40 D
7.80 D
8.00 D
9
Multiple Choice
Calculate the anterior crystalline lens power.
n aq = 1.336
n lens = 1.41
r1 = 10mm
r2 = - 6mm
11.5 D
12.0 D
12.33 D
13.33 D
10
THANK YOU
REVISION
SCHEMATIC EYE
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