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How to Select a Good Binocular Loupe

Having an Eye Loupe or telescope in a Dental Clinic or in a Micro Surgeon’s office is not a luxury but a necessity as Loupes not only help Dentists or Surgeons to improve their performance but help eliminating the causes such as Lower Back Pain or Eye Strain which contribute in shortening the professional career of a Dentist or Surgeon.

Based on benefits a dentist or surgeon should look for in a Loupe, the evaluation of a loupe can be divided into two major categories.

  • Magnification Performance
  • Ergonomic Design

Figure AA good Eye Loupe has to excel in both Magnification Performance as well as Ergonomic Design Magnification Performance A poor quality Loupe generally suffers from Low Resolution, Chromatic Aberration or Spherical Aberration. Viewing colorful or complex objects such as inside of your hand does not help in evaluating the magnification performance of different loupes. The best method is to simply view a small piece of graph paper and look for straight black lines as shown in Figure A; you will clearly be able to see the difference between mediocre or high quality loupes as explained below.

figure bResolution is defined as an optical system’s ability to form distinguishable images of objects separated by small distances, or to recognize fine details. When comparing different loupes, look at the testing objects and select an area of tiny details that can only be seen with magnification. For an actual graph paper as shown in figure A you should be able to see figure B if your loupe is of good quality.

Chromatic Aberration refers to color distortion. Each color has a different wave length, figure cuncorrected optics in loupe cause various wavelengths to focus at different points in space. The first color that generally comes out of focus is blue. When looking at black lines on a white paper through the loupe and if you see a blue haze just to the side of black lines (as shown in figure C), this means your loupe suffers from Chromatic Aberration.

figure dSpherical Aberration is flatness of an image. When looking at black lines on a white paper viewed through a loupe, you see curved or spherical lines closer to edge (as shown in figure D), your loupe suffers from Spherical Aberration.



STAC AdvantageAll STACT Binocular Loupes use microscopic lenses and are laser aligned. Further they pass through rigorous quality test for optics positioning to provide you crisp, sharp and clear image from edge to edge.


Ergonomic Design The design of any loupe plays an important role in the comfortable working posture of its user thereby reducing the unnecessary eye strain and lower back pain and neck pain. A good quality loupe will provide you better light transmission, larger depth of view, wider field of view, correct intra papillary convergence, correct angle of declination and correct working distance.

Light transmission is important not only for quality of image but also for the comfort and safety of your patients. Optimized light transmission means that you can work with less light, reducing your eye strain while minimizing the exposure of your patient to bright lights.

Depth of View is defined as the range that’s in focus away from and towards you without moving your head. The ergonomic benefit, or how comfortable the loupes are to wear, of a large depth of field are clear because there is less need to move your back and neck to work effectively.

Field of view refers to the amount of the original object that you can see at one time. Different applications have different needs. A bigger field of view is not always the better choice; for instance, an endodontist might prefer to see only the area of focus, whereas a periodontist would like to see as much of the surrounding area as possible. Field of view is more of a personal preference and comfort of Dentist or Surgeon.

Intra pupillary convergence refers to functional Inter Pupillary Distance established by your eyes when working at closer point as compare to Distant Interpupillary distance which is distance in millimeters between pupils of the eyes. You work at two different interpupillary distances at each procedure through out the day (see figure 1).


Inter Pupillary Distance

A good loupe has to align to your functional interpupillary distance to function properly and give you comfort while working.

Angle of declination refers to angle of the loupe from the straight line through the eyes. The correct angle saves you from neck pain as you will not need to bend to get the correct view of your patient’s focused area.

Working distance refers to the distance between dentist or surgeon and part of the patient on which a procedure is to be performed. The requirement of working distance depends on height of the dentist or surgeon, whether he or she is performing the procedure in sitting position or standing position and normal posture habit. As the loupes are generally having fixed focus and a fixed working distance, it is important to match the working distance of the loupe with your requirement. The unmatched working distance with loupe will increase the risk of lower back pain.

STAC Advantage
  • STACT loupes are laser aligned for the optimized light transmission.
  • STAC Loupes provide you the widest depth of view in its range.
  • STAC Loupes give you wide range of magnification power to match your magnification and field of view requirement.
  • STAC loupes are designed to adjust the interpupillary distance to meet your specific need.
  • STAC Loupes have double hinge design which provides you to change the angle of declination (up to 45 degree) to get your preferred working posture.
  • STAC Loupes provide you 4 different predefined working distances. This provides you the widest range to choose from. You will find the perfect working distance whether you are performing a procedure in sitting position or standing position. (Refer to our technical specification sheet to match your requirement)

Side by side comparison is the best method to evaluate the performance and design of a loupe. After this evaluation you will also say:

With STAC Binocular Loupes the Difference is Clear

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Canadian Quality

STAC is flagship brand name for STAC Dental Instruments Inc, Canada. Our vision is to provide 100% satisfaction to our customers. We carefully establish specifications at the time of design and development of STAC products. Specifications which meet the performance as well as style requirements of customers. In actual manufacturing process quality is checked at three stages against these specifications...

Testimonials and Feedback

Dr. Joe Castiglione
Date: Oct 05, 2009

I purchased loops from ACTS Medical over six months ago and have never looked back. The price and quality of loops is unbeatable by in the market today. I had taken a test pare of another brand name at the same to compare and found the field of view is far superior in the ACTS loops compared to the name brand "High Definition" pair. As...


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