1
4
. OPTICIAN GUIDANCE NOTES
The set of
Riester
surgical loupes have been supplied to your customer with Plano lenses fitted. We
hope that the following notes on lens fitting and frame adjustments will help you, help your customer
obtain the best from their loupes.
There are two types of binocular telescopes used in
Riester
loupes:
Galilean based on a Galilean optical system
Panoramic based on a Keplerian telescope system incorporating a roof prism.
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) 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.
Varifocals are not suitable for fitting to
Riester
loupes.
Fig. 12
