1. Chapter 10. Diseases of the lens
Defination of cataract
Transparent lens becomes opaque,
called cataract
VA<0.7
Types of cataract
age-related ,congenital ,
traumatic, diabetic,etc

2. Age-related cataract Etilogy: risk factors heredity ultraviolet ray
systemic disorders(hypertension,
diabetes, arteriosclerosis)
nourishment condition

3. Clinical manifestation
Bilateral, onset may be early or late,
Progressive blurred vision
Fixed black spot
Monoular diplopia
polyplopia

4. cuneiform tips toward the center, 2. Intumecent stage:
Cortical cataract
1. Incipient stage:
cuneiform tips toward the center,
VA normal, sphenoid shadow,
2. Intumecent stage:
opacities develop gradually, swollen
iris forward, ant.chamber shallowed,

5. morgagni’s, milk-like, iridonesis,
glaucoma may occur
3. Mature stage:
complete opaque
4. Hypermature stage;
morgagni’s, milk-like, iridonesis,
nucleus fallen down, capscule shrink,

6. rupture: lens-induced uveitis, phacolytic glaucoma, easy to lead:
dislocation of the lens
or subdislocation

7. Nuclear cataract at beginning, lens nucleus
appears grey-yelloeish, its
color becomes deeper with
going near to the center.

8. Posterior subcapsular cataract Golden yellow or white particles,
mixed with small vacules in them
occur at shallow layer of subcapsular
cortex in posterior pole of the lens.
Opacities at visual axis, VA reduce
at early stage.

9. Treatment Surgery 1. Glasses 2. Contact lens 3. ECCE, 4. ICCE,
5. Phaco,
6. IOL implantation

10. Drug therpy
Placibo, antioxidant
Vit B2
Vit C
Vit E

11. Question:
1. How to correct aphakia after cataract
surgery?
2. How many types of age-related
cataract?

12. Congenital cataract Etiolgy hereity viral infection
drug abuse during 1st trimester
metabolic disoders during
pregnancy

13. Clinical manifestation
1. Anterior polar cataract
2. Posterior polar cataract
3. Coronary cataract
4. Punctae cataract
5. Perinuclear cataract

14. 6. Nuclear cataract
7. Total cataract
8. Membranous cataract
9. Suture cataract

15. Diagnosis & Treatment
Easy to diagnose
Surgery: aspiration
correction after surgery:
1.Glasses
2.Contact lens
3.IOL implantation

16. Traumatic cataract Etiology 1. Contusion 2. Penetrating 3. Explosive
4. Electric

17. Diabetic cataract
Complicated cataract
Toxic cataract
After-cataract
Dislocation or sublislocation