Ocular IVS2, Product Manual

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26
Technique – OWIV-HMNA
The lens is held on the eye by suturing one of the Landers Lens Rings to
the sclera.
After a suitable wetting agent is placed on the cornea, the lens is placed on
the cornea.
Many surgeons do not use an inverted image contact lens until the anterior third of the vitreous has been
removed and a deeper image of the vitreous cannot be obtained with normal microscope observation.
Turn off the coaxial and oblique illumination of the microscope, since this may lead to reflections from
the contact lens surfaces. Check the positions of instruments repeatedly before and during the operation,
as it is very difficult to recognize the patient’s crystalline lens through a contact lens.
With the microscope set at the lowest magnification and the microscope head travel at the lowest position,
move the microscope to obtain a focus on the cornea. Once the lens has been placed on the eye, focus the
microscope using the focusing adjustment mechanism away from the patient to focus on the image.
It is recommended to work at the magnification where the fundus image just fills the microscope field of
view.
Be sure the lens is seated well on the cornea. If the assistant has a poor image and you find the image
good (or vice versa), it is possible only one observation beam path of the microscope is receiving and
transmitting a good image. Slightly shifting the lens will correct the problem.
Keep endo-illumination as far as possible from the retina and increase illumination at its tip. This utilizes
the wide-angle effect of the lens to its fullest. Light intensity at the retina will be somewhat reduced due to
the distance from the retina.
Cleaning & Disinfection
See Cleaning Method 8
.