Lens

Front 1

Structure of lens

refractive index

Dioptric power

two surface

Back 1

Structure

1 lens capsule

2 cortex

3 nucleus

refractive index 1.39

19 D

Anterior surface is less convex ( radius of curvature 10mm) than the posterior ( radius of curvature 6mm)

Front 2

Ectopia

Definition

topographical types 2

Back 2

Displacement of lens from its normal position results from partial or complete rupture of the lens zonules

1 subluxation

2 dislocation or luxation of the lens

Front 3

Subluxation

Clinical features 4

Management 3

Back 3

Its partial displacement in which lens is moved sideways ( up,down,medially,laterally) but remains behind the pupil

Clinical features

1 defective vision - astigmatism or lenticular myopia

2 uniocular diplopia - result from partial aphakia

3 anterior chamber become deep and irregular

4 iridodonesis present

Management

1 spectacles or contact lens correction for phakia or aphakic area

2 surgery

3 lensectomy

Front 4

after cataract or secondary cataract

Back 4

Its the opacity which persists or develops after extracapsular lens extraction

Clinical types

1 thickened posterior capsule or

dense membranous

2 thick ring of after cataract formed behind the iris or

Soemmering's ring

3 vascuolated subcapsular epithelial cells are clustered like sop bubbles

Treatment

1 YAG laser

2 surgical membranectomy

3 YAG laser

Front 5

Back 5

A

Front 6

Back 6

D

Front 7

Back 7

A

Front 8

Back 8

A

Front 9

Back 9

A