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Table 1 A summarization of the geometric and mechanical properties of cases #1 - 10

From: Etiology of Keratoconus: proposed biomechanical pathogenesis

 

Description

Geometry

Mechanical properties

  

Minimal thickness [μm]

Region diameter [mm]

Elastic modulus [MPa]

Region diameter [mm]

Case 1

Nominal

500

-

0.4

-

Case 2

Mildly thin

350

2

0.4

-

Case 3

Severely thin

140

2

0.4

-

Case 4

Small defect

350

0.35

0.4

-

Case 5

50% more compliant

500

-

0.2

4

Case 6

70% more compliant

500

-

0.12

4

Case 7

90% more compliant

500

-

0.04

4

Case 8

Off-center thin

250

2

0.4

-

Case 9

Off-center more compliant

500

-

0.04

2

Case 10

Concentric stiffening

500

-

0.35

5

0.6125

5-6

0.875

6-7.5

1.225

7.5-11