Frequently Asked Questions


1. What is the difference between SandyGrendel Design Loupes and other surgical telescopes?


Features and benefits

  • The SandyGrendel Design System is modular, every part is easily exchangeable.
  • Light weight pure Titanium frame, hypo-allergenic, non-corrosive.
  • Integrated protective screen (Pat.) made out of polycarbonate (UV 385 nm) can be removed within seconds.
  • The SandyGrendel  SG 2.5x/3.3x telescopic magnifying units are light weight, small size, elegant, attached to the protective shield and fully adjustable to IPD.
    The loupes are made out of precision ground mineral glass and aluminum, no plastic!
  • SandyGrendel Design Surgical Telescopes are washable under running water.
  • Your prescription lenses (if necessary) are well protected from splashes and debris during medical procedures, furthermore they are detachable in no time at all (this is important if you also wear contact lenses alternately).
  • The fiberoptic cable can be easily attached to the shield.
  • The nose pads are welded to the frame to ensure optimal fit for all nose shapes.

As a result

  • Titanium-Pro has an outstanding design which combines pleasing aesthetics with the highest level of functionality.
  • Titanium-Pro provides superior wearing comfort due to innovative design features and high frame flexibility. The extreme light weight ensures a perfect fit at any head position. Retaining bands are unnecessary and a feature of the past.
  • Titanium-Pro frame + protective screen + magnifying units SG 2.5x = 1.2 oz. (36g).
  • Due to small telescope size the view is not reduced and surrounding field control is ensured.
  • Titanium-Pro does not interfere with surgical masks, as they fit precisely between protective screen and nose pads without obstruction to wear and comfort.
  • Titanium-Pro can easily be cleaned and disinfected.
  • If new prescription glasses are needed, every optician is able to exchange the lenses. The loupes are not affected.


2. The Power of Magnification

A first user mostly believes: “The more magnification the better.”
Fact is: "As much magnification as necessary, as little magnification as possible." just about sums it up correctly.
(H. Gottlob,Product Manager, Carl Zeiss, Germany).


The higher the magnification,

  • the smaller becomes the field of view (a decrease by the power of 2).
  • you will have not a large enough field of view for accurate aesthetic dentistry that requires a diameter of ~2.5 inches, as one has to refer to the neighbouring teeth. .
  • the depth of field sharpness becomes narrower (decrease by the power of 2).
  • the margin of your working distance gets smaller (decrease by the power of 2), luminous intensity decreases.
  • observance of the surrounding field (visual monitoring of the patient) becomes more difficult.
  • head movement is more irritating because even small movements quickly have you sight out of range and field of view.

Physical laws apply to all manufacturers of optical instruments all manufacturers of optical instruments.

According to our extended experience and feedback from our customers a magnification factor of 2x or 3x is sufficient for most dental procedures and needs of the dentist considering all relevant factors.

In the final analysis 2 important advantages emerge when operating with telescopes:

  • The working distance (distance from the eye of the dentist to the mouth of the patient) must be kept relatively constant. This leads to a better posture.
  • The muscles of the eyes are not stressed by an incessant near-accommodation. The result is a fatigue induced, poor work.

scope view normal scope view to big
The maximum possible enlargement and the optimal relevant magnification are two different things!



3. Will long term daily use of magnifying loupes/scopes affect my vision?

  Use of magnification devices (or any optically ground lens, for that matter) will not adversely affect vision in the short or long term. Some people will initially experience some post-use blurring, eyestrain, or headache, but this should only occur in the beginning after initial use and not persist if at all for more than a few days. Your visual perception will adapt to the magnification change. If long term problems persist, return to your prescribing doctor for a checkup. Surgical telescopes have been used for the last 30 years by dentists, ophthalmologist, neurosurgeons, plastic and vascular surgeons! To date, there are no known adverse effects from any form of surgical magnification.  


4. Should I wear contact lenses during a procedure or operation?

There is no reason contact lenses cannot be used during surgery. However, the eye must be protected at all times against foreign matter and splashes. If contacts are used, safety lenses (with or without telescopes) are mandatory. Careful consideration must be given to adequate cleaning and disinfection of contact lenses and this should be discussed with your prescribing doctor.


5. At what age should I start using surgical magnification?

Surgical magnification can be used at any age and is now readily available to dentists and surgeons in training. The magnification effect enables work to be done more comfortably and effectively, it is therefore worthwhile to start as soon as possible.


6. If I wear reading glasses, does that need to be taken into account with my prescription?

Please download PDF file to find the right solution for your prescription.


7. What is the best way to disinfect or sterilize the telescopes between patients?

Is there any need to sterilize or disinfect telescopes at all? The surgical telescopes used in medical microsurgery are seldom if ever sterilized or disinfected, nor is other sensitive equipment if not a risk in the operative field. In order to protect telescope performance, the MINIMUM CLEANING AND DISINFECTION CONSISTENT WITH GOOD SURGICAL PRACTICE should be employed.


8. What is the advantage of a headlight?

The most important advantage of a coaxial headlight is to always have the light at the right spot - wherever you are looking, a tremendous advantage to perform accurate and precise work! The headlight will produce enhanced illumination of the actual work area e.g. oral cavity or other operating areas.


9. What light source should I choose?

We recommend the SandyGrendel SwissLed headlight
the advantages are:

• High capacity output (~20'000 lux at 350mm distance for 4 hrs. continuous use).
• Precision focused LED light, no glare for patient.
• Efficient electronically controlled power supply prevents heat development.
• Colour temperature is 6050 degrees Kelvin, similar to daylight values.
• Operable with battery pack or 110V adapter.
• LED light is horizontally and vertically adjustable.
• Yellow filter available to prevent premature curing of composites.
• Power supply box is small and light in weight, fits easily in coat pocket.
• Standard rechargeable Ni metal batteries are easily available.
• Headlight is small, light weight and easy to keep clean.
• Available with universal or SandyGrendel Ti-Pro adapter.  

• Weight including adapter is less than 28g (1 oz.)

alternatives are:

  • Xenon lightsource with fiberoptic headlight
    Xenon lamps produce a cold and blue light, they run on high voltage. Xenon lamps can not be dimmed, but the output power can be reduced with an iris.
    Exchange bulbs cost around US$ 500.00 and should work up to 6000 hrs. However, the manufacturers grant only three months warranty on the bulb  (~480 hours if the lamp is running  8h a day, 5 days a week).

  • Halogen lightsource with a fiberoptic headlight
    It has a warm color and low voltage and an electronic dimming feature. Lamp exchange is easy and economical. Replacement bulbs are very reasonably priced at approx. $ 8.00. Heavy use requires 5-10 bulbs/year.


10. What can I do if the loupes distance and working distance do not match?

Our loupes are marked with a specific working distance in milimeters. If the loupes distance does not match with your personal focal distance you may need a prescription for your eyes. The working distance of our loupes can be changed easily by replacing the cylinders to another distance. We have several standard focal distances available. Please watch Instructional Video Clip.