Ophthalmology ppt

1. Intraoccular Lens
Name: Shantkumar
Roll no : 40
Moderator : Dr. Amruta

2. HISTORY OF IOL

3. Parts of an IOL
• OPTIC
Part of the lens that focuses
light on the retina.
• HAPTIC
Small filaments connected to
the optic that hold the lens in
HAPTIC OPTIC

4. TYPES OF IOL
Based on the method of
fixation in the eye
1. Anterior chamber implantation
2.

5. 2. Iris- fixated lens
•Fixed on the iris with
claws,loops or sutures
•Eg- Singh and Worst’s iris
claw lens

6. • 1.Posterior chamber
implantation
•Ciliary sulcus fixation
•In the bag fixation
•Scleral fixation
• Retro iris fixation
Eg:- 1. modified C loop
type IOL
2. 4 loop type 1 2

7. In-the-bag fixation

8. Ciliary sulcus fixation

9. Depending on the material of manufacturing
1.Non-foldable-rigid IOL
•Polymethyl methacrylate(PMMA)
2.Foldable IOL
•Silicone
•Hydrophobic acrylic
•Hydrophilic acrylic
3.Rollable/Ultra-thin
IOL
•Hydrogel

10. Based on the focusing ability
1. Unifocal IOLs
2. Multifocal IOLs
3. Accomodative IOLs
4. Extended depth of focus IOLs
5. Aphakic VS Phakic refractive IOLs

11. Accomodative IOL
Multi focal
IOL
Uni focal IOL

12. Special function IOL
1. Toric IOLs
2. Aspheric IOLs
3. Aniridia IOLs

13. Calculation of IOL Power
SRK formula {Sanders,Retzlaff,Kraff}
P= A-2.5L-0.9K
P: power of lens
A: constant for specific lens
L: axial length of eyeball
K: average corneal curvature

14. Primary vs secondary implantation
•Primary implantation – use of IOLs during surgery for
cataract
• Secondary implantation – implantation of IOL to correct
aphakia in a previosly operated eye