The influence that ophthalmic viscosurgical device gives intra ocular pressure during small incision and ultra small incision cataract surgeries

1
The influence that ophthalmic viscosurgical
device gives intra ocular pressure during small
incision and ultra small incision cataract
surgeries

• Takuya Shiba, Takako Torisu, Akiko Hayama Katsuya
  Mitooka, Hiroshi Tsuneoka
• Department of Ophthalmology
• Jikei University School of Medicine
• Tokyo, Japan

The authors have no financial interest in the
products mentioned in this poster
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Objective

• Using the experimental model we originally
  prepared, we estimated the difference in the
  inner pressure of the anterior chamber filling a
  different type of ophthalmic viscosurgical
  devices (OVD) in hydrodissection during small
  incision and ultra small incision cataract
  surgeries.

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Methods 1/3

• We made the diameter of the top of the pipettes
  1.5mm (micro bimanual phaco group), 2.4mm (micro
  coaxial phaco group), and 3.0mm (coaxial phaco
  group).

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Methods 2/3

• Filled the pipettes with OVD, and applied 5mmHg
  of constant pressure, using a pressure pump to
  imitate the process of hydrodissection, and then
  measured the inner pressure of the pipettes.

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Methods 3/3

• Used 4 types of OVD
• Low Viscosity Dispersive
• Opegan (Santen, Japan)
• Midium Viscosity Dispersive
• Viscoat (Alcon, USA).
• Viscous Cohesive
• Opegan Hi (Santen, Japan)
• Viscoadaptive
• Healon 5 (AMO, USA)

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Results 1/2
3.0mm Coaxial Phaco
Viscoat
Healon 5
Opegan
Opegan Hi
2.4mm Micro Coaxial Phaco
Opegan Hi
Opegan
Viscoat
Healon 5
1.5mm Micro Bimanual Phaco
Opegan Hi
Opegan
Viscoat
Healon 5
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Results 2/2

• The micro coaxial and micro bimanual groups have
  shown a difference in the inner pressure with
  Opegan and other OVDs that is greater than that
  of the coaxial group.

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Discussion

• Intraocular Pressure / Incision Size (mm)
• Low Viscosity Dispersive (Opegan, etc)
• 3.0 2.4 1.5
• Viscous Cohesive (Opegan Hi, etc)
• 3.0 2.4 lt 1.5
• Midium Viscosity Dispersive (Viscoat, etc)
• 3.0 2.4 ltlt1.5
• Viscoadaptive (Healon 5, etc)
• 3.0 lt 2.4 ltltlt1.5

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Conclusion

• Our results suggested the necessity of selecting
  a low-molecular dispersive type of ophthalmic
  viscosurgical device for anterior capsulotomy
  when we implement small-incision and
  micro-incision cataract surgeries.