Keeler LOUPES, Инструкция по эксплуатации, Страница: 14 / 16

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EN
KEELER LOUPES
8.1 PRESCRIPTION FITTING
First establish the following facts:
1. The type of Loupe (i.e., Galilean, or Panoramic).
2. The magnification.
3. The working distance or focal length (noted on the loupes).
4. Your customers interpupillary distance, taking the working distance / focal length of the
Loupe into consideration.
It is important to fit the frame as close as possible to the eyes so that your customer can obtain
the widest field of view.
Any distance prescription should be fitted with centers to coincide with the Loupe IPD setting.
If fitting bifocals, care should be taken to fit the bifocal segment either below or above the
rim of the telescope (Fig.12, page 9) never in between. If the near vision ADD is more
than +2D the bifocal segment should be fitted below the lower rim of the telescopes to avoid
shortening the focal length of the telescopes and causing double vision.
Note: Varifocals are not suitable for fitting to Keeler Loupes.
In most cases the Bifocal ADD should be the same as the normal prescription. However, some
surgeons prefer the ADD to be of a power that produces a working distance similar to that of
the Loupe telescopes. This avoids constant accommodation as they alternatively look through
the Loupe and alongside for orientation. Others prefer a weaker ADD for easier focusing onto
surgical instruments outside the operative area. Discuss this matter with your customer to
ascertain which option is best suited to their needs.
Note: All lenses should be plastic.
Once your customers Loupes have been glazed, it may be necessary to place the Loupes on the
front stop of the Loupe pins to prevent the telescopes from touching the lenses, particularly
where the curvature of high-powered lenses prevent the Loupes from being angled fully
downwards.
8.2 CORRECT FITTING OF KEELER LOUPES
When you have glazed your customers correction into the Loupe Frame, we would be grateful
if you could offer further assistance to help them ‘set up’ the Loupes correctly so that they
can obtain the best from them. Full fitting instructions are given on Setting up and using your
Loupes, page 6.