1. Conventional LASIK V/S Zyoptix LASIK
I HAVE NO FINANCIAL INTEREST
Author – Dr Rohit Nanda
Co- Authors – Dr R.S .Nanda, Dr Aditi Singh, Dr K.P Srinivas Rao, Dr G .Srinivas Rao, Dr Joe Mathew,Dr Altaf Akbar

2. RETROSPECTIVE STUDY
74 EYES OF 41 PATIENTS

3. ROUTINE PATIENT EVALUATION
UCVA
BCVA
SLITLAMP EXAMINATION
APPLANATION TONOMETERY
MANIFEST AND CYCLOPLEGIC REFRACTIONS
ORBSCAN AND ABERROMETERY
CORNEAL PACHYMETERY AND CORNEAL DIAMETER
SCHIRMER TEST

4. ROUTINE PATIENT EVALUATION Contd…
Indirect Ophthalmoscopy
Done in all patients
Contact lens wearer patients were asked to discontinue contact lens for:
One week if wearing soft contact lenses
Two weeks if wearing RGP lenses.

5. Procedure 45 eyes underwent Lasik Surgery
Mean age 24 Years ( Range 18 Yrs to 30 Yrs)
Male Female : 4:6
29 eyes underwent Zyoptix Surgery using Bausch and Lomb technolas 217z machine .
Parameters Used:
Wavelength 193nm,
Fluence 130mj/cm2
Ablation zone diameters between 4.8mm and 6mm
HANSATOME used :
BAUSCH AND LOMB (180uM and 160M PLATE)

6. RESULTS Group A Group B -4.28D +/- 0.75D -3.25 D+/- 0.50D
Pre Operative ( mean spherical value)
-4.28D +/- 0.75D
-3.25 D+/- 0.50D
Post Operative ( mean spherical value)
0.13+D/-0.13D
0.15D +/- 0.68D
Group A
Group B
Pre Operative ( mean Cylindrical value)
-1.16 D+/ D
-2.00 D +/-0.60 D
Post Operative ( mean Cylindrical value)
-0.10 D +/-0.20 D
-0.08D +/-0.24D

7. RESULTS Contd… Type of Surgery LASIK ZYOPTIX
No. of Eyes where aberrations found to be Nil ( Group A)
No. of Patients where aberrations found to be Nil ( Group B)
3rd Order 7 5
4th Order 17 9
5th Order 28 12

8. Visual Acuity in %age in Pre and Post Operative Patients
78% of the Group A eyes attained
>=6/6 UCVA post operative
76% of the Group B eyes attained
>=6/6 UCVA post operative

9. Visual Acuity in %age in Pre and Post Operative Patients
84% of the Group A eyes attained
>=6/6 UCVA post operative
76% of the Group B eyes attained
>=6/6 UCVA post operative

10. Graph showing higher order
aberration
detection at varying pupil
sizes.

11. Comparison between pre & postoprative aberrations
Z20- Defocus
Z22-Astigmatism
Z31-Coma
Z33-Trefoil
Z40-Sph-aberration
There is drastic decrease in 2nd order aberrations postoperatively.

12. Conclusion
Decreased aberrations in patients who underwent lasik and zyoptix.
Lasik removes higher order aberrations in few patients but the point spread function is a large blur, leading to lower clarity of vision.
Zyoptix performs customized ablation minimizing the wave front deformation.The point spread function is a small spot of light, leading to clarity of vision.
Removal of the wavefront aberrations may extend the benefit of
improved UCVA to patients with abnormal wavefront.