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Conventional LASIK V/S Zyoptix LASIK

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. RETROSPECTIVE STUDY 74 EYES OF 41 PATIENTS. ROUTINE PATIENT EVALUATION.

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Conventional LASIK V/S Zyoptix LASIK

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  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 . ParametersUsed: • Wavelength 193nm, • Fluence 130mj/cm2 • Ablation zone diameters between 4.8mm and 6mm HANSATOME used : BAUSCH AND LOMB (180uM and 160M PLATE)

  6. RESULTS

  7. RESULTS Contd…

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

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