The document discusses various viewing systems used in VR surgery, particularly for ophthalmic procedures, detailing both contact and non-contact lenses. It highlights the advantages and disadvantages of each system, including their imaging capabilities and practical applications. Recent advances in the technology, such as the optical fiber-free intravitreal surgery system, are also noted.

2. Viewing systems in
VR surgery
DR ABHISHEK GHELANI MS
SHANTI SAROJ NETRALAY

3. Conventional contact lens system
 Planoconcave, field 20’
 Biconcave 30’
 Prismatic lenses 60’
 Direct erect image, no need for inverter

4. Sutured lens
Landers lens system

6. self-retaining contact lens
 standard Machemer plano-concave (−60 diopters) onepiece acrylic lens
with four footplates

7. Wide angle viewing systems
 based on the principle of binocular indirect ophthalmomicroscopy
 contact and noncontact mode
Non contact viewing Contact viewing
Advantages
• assistant is not required
• no intraoperative corneal trauma
• provides a good view during air-fluid
exchange and in patients with steep corneas
and small pupils
Advantages
• image resolution and stereopsis are superior
• field of view is also wider
Disadvantages
• Poor view in patients with corneal trauma
• Need an assistant

9. ROLS (reinverting operating lens system)
OIVS (ocular inverter vitrectomy system)

10. Non contact systems
 BIOM(binocular indirect ophthalmo microscope)

12. Non contact systems
 optical fiber-free intravitreal surgery system by Topcon (OFFIS)
 can see the fundus with illumination incorporated into the microscope
without using a light probe
 Working distance from the cornea is more
 cannot be adapted to other microscopes
 40 D 50’
 80 D 70’
 120 D130’

13. Non contact systems
 From ocular OSVS (ocular sergical viewing system)
 The Peyman-Wessels-Landers 132 D upright vitrectomy lens
 132 D indirect lens
 without an inverter because of an internal prismatic system
 Less cost

Image Mag: .45x
Static FOV: 100°
Dynamic FOV: 135°

14. Non contact systems
 EIBOS (erected image binocular microscope)
 In-built inverter
 90, 132 D lenses
 100, 125 degree field

15. Non contact systems
 Volk merlin

16. Non contact systems
 Ziess resight 500 and resight 700
 Autoclaveable 60 D and 128 D

17. Contact Systems
 needs an inverter to re-invert the intraoperative image
 they are bulky and not very stable on the cornea

18. Contact systems

19. Contact systems

20.  Small size, ideal for paediatric use
 Primarily meant for ROP patients

22.  Ocular Lenders equatorial vitrectomy II
 Image Mag: .65x
Static FOV: 101°
Dynamic FOV: 131°

23.  Ocular landers wide field

Static FOV: 130°
Dynamic FOV: 146°

24.  HTC lens from oculus
 Hassan tornambe lens
 36° field of view

25. RECENT ADVANCES
 optiplex

26. THANK YOU