5.6 VITRECTOMY (VIT) MODE
Vitrectomy is used to remove the vitreous from the anterior chamber of the eye if the posterior
chamber is ruptured. Vitreous loss can occur after a trauma during the primary cataract
surgery itself.
The Vitrectomy procedure is performed with a pneumatically-controlled disposable or reusable
guillotine cutting needle. The vitreous material is aspirated into the port of the needle and cut
by the guillotine cutting action. During the Vitrectomy procedure, Irrigation and Aspiration are
required to prevent the collapse of the cornea. The aspirated material is replaced with
irrigation solution.
The irrigation source is provided by an inverted container of irrigation solution, which is suspended
above patient eye level in the operating room. The delivery amount of the irrigation solution is
controlled by the height of the container.
The foot pedal has two (2) positions in the Vitrectomy (VIT) Mode:
1. Position (1): Irrigation
2. Position (2): Irrigation, Aspiration, and Cutting
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