1. WOUND CLOSURE (VECTOR ANALYSIS)
PHACO
ECCE
VERTICALLY APPLIED IOP AND TISSUE FORCES IN OPPOSITE DIRECTION
HORIZONTALLY APPLIED SUTURE FORCE

2. DYNAMICS OF SUTURELESS CATARACT INCISIONS
THEORY
THEORY
Corneal flap mechanism
Square incisional geometry

3. SQUARE INCISIONAL GEOMETRY
EXTERNAL INCISION
INTERNAL INCISION
TUNNEL SIZE

4. astigmatically neutral funnel
corneal astigmatism is directly proportional to the cube of the length of the incision
inversely related to the distance from the limbus

5. SELF-SEALING WOUND DEPENDS ON
The architecture of the wound
Delicate handling of tissue edges
Adequate intraocular pressure

6. PHACO INCISION GOALS
INTRAOPERATIVELY
POSTOPERATIVELY

7. INTRAOPERATIVE Allow Easy Entry Of The Phaco Needle
Allow Ease Of Mobility Of The Phaco Needle
Minimize Incision Leak
Prevent Incision Burn.

8. POSTOPERATIVE Self Sealed Astigmatically Neutral
Both In Short Term And Longterm

9. vital statistics of a phaco incision
1. Site (limbal or …)
2. Placement (time of incision!)
3. Style(mood of the incision!)
4. The length of the external incision
5. Length of the sclerocorneal tunnel
6. Depth of tunnel dissection
7. Size of initial opening for phacoemulsification Size of incision for IOL insertion
9. Paracentesis opening

10. INSTRUMENTS REQUIRED FOR THE PHACO INCISIONS(sclera tunnel)
A 15° freehand/preset depth (300 micron
A 2.0 mm broad crescent blade
A suitable breadth keratomewith a 90 degrees angle at the tip (bevel up)
A 0.6 to 1.0 mm broad blade for the paracentesis
A blunt tipped extender blade (bevel down)
A caliper

11. TECHNIQUE OF MAKING A PHACO (Scleral Tunnel) INCISION
Peritomy and cautery
Grooving
Tunnel dissection
Stab incisions and AC viscoinjection
AC entry

12. clear corneal incision (advantages)
Well suited for topical anesthesia
lesser risk of bleeding
better accessibility
better red reflex
eliminates the conjunctival incision
minimal or no effect on astigmatism

13. disadvantages of clear corneal incision
technical difficulty
lack of forehead support
need to enlarge for use of nonfoldable IOLs
difficulty in converting to a ECCE
potential for greater endothelial cell loss
.possible corneal thermal burns
.higher incidence of endophthalmitis in some studies

14. Proposed incision for begginers (changing ECCE to phaco)
limbal groove
Straight or
Parallel to limbus
Biplanar
Slightly wider than phaco tip

15. PARACENTESIS OPENING required for bimanual techniques
Usually on the left side (30-90 degree)
0.6 to 1.0 mm in breadth
simple stab or shelved

16. Clear Cornea Incision With initial partial thickness vertical incision
Without an initial incision

17. ASTIGMATIC INDUCERS 1. Longer incision. 2. Corneal incision.
3. Limbus parallel incision.
4. Uniplanar incision.
5. Sutured incision

18. The caliper is set at 2.8 mm.

19. A light indentation on the peripheral corneal surface is created with the pointed ends 0f the caliper.

20. A 150-300-um-depth groove is created

21. A paracentesis incision is created with the diamond blade fully extended

22. An oblique entry is created as the blade not only driven through the corneal stroma to Descemet 's level. but also slices to the surgeon 's left. Notice the compression of tissue being created because ofthe relatively dull blade

23. Descemet's level is entered 1
Descemet's level is entered 1.75 mm from the epithelial level as the blade is swept to the left.