Ergonomic Advantage – Expanded-Pupil Technology

Expanded-Pupil technology

Vision Engineering holds world patents for a number of optical technologies which improve optical and ergonomic performance of traditional eyepiece microscopes.

Since the invention of the microscope in the 1590’s, there have been many technological developments in the design of the optical microscope. However, one thing has remained constant in all this time – microscope eyepieces.

The inherent issue with microscope eyepieces is that users must very precisely align their eyes with the narrow beams of light which exit the microscope eyepieces.

Operators must keep their head position fixed, which causes fatigue and discomfort. Additionally, the intensity of the light viewed through the eyepieces causes the pupils to contract. Constant contraction and expansion of the pupils is the main cause of eye strain and fatigue. What’s the solution?

The Solution…‘Expanded-pupil’ microscope eyepieces

Vision Engineering’s patented ‘expanded-pupil’ eyepieces remove the need for users to precisely align their eyes with the eyepieces. In fact, the user can sit back from the microscope (up to 38mm) and still view the image.

This freedom of movement reduces neck and back strain, making microscope use more ergonomic, more efficient and much more comfortable. The additional distance between the eyes and eyepieces also allows ambient light into the eyes providing a more natural view of the subject

  • Superior ergonomics, for sustained comfort
  • Offers eye-relief and freedom of head movement
  • Enables users to wear glasses

Improved microscope ergonomics

When viewing any subject through a microscope, the image you view “exits” through the microscope eyepieces. ‘Expanded-Pupil’ technology expands the optical image exiting the eyepieces.

Traditional microscope eyepieces

Microscope eyepiece standard exit

Narrow, highly concentrated light paths of traditional microscope eyepieces

Typically, a slight head movement, or movement of the eye results in loss the image.


Expanded-pupil eyepieces

Microsopce eyepiece expanded pupil exit

Broad, less concentrated light paths means that the user can sit back from the eyepieces.

In fact, the light exiting the eyepieces is 10x wider than traditional eyepieces, meaning users do not need to precisely align their eyes with the eyepieces.

‘Expanded-pupil’ eyepieces overcome the requirement for users to precisely align their eye with the center of each eyepiece, allowing for a more comfortable working position.


‘Expanded-pupil’ eyepieces also afford users greater freedom of head movement, reducing fatigue, as well as increasing the

Expanded pupil microsope eypeice

distance between the user’s eyes and the eyepiece by a factor of four.

But how does it work?

At the heart of Vision Engineering’s patented ‘expanded-pupil’ technology lies a rotating multi-lenticular [multi-lens] disc.

Multi lenticular Optics ISIS Expanded Pupil Technology

Rotating multi-lenticular disk
Hexagonal lenticular array
3.5 million+ individual lenses

On the surface of the disk there are more than 3.5 million individual lenses (known as lenticules), which act as independent image-forming surfaces. Each individual lens has a diameter of just a few microns (1 micron = 0.001mm).

The multi-lenticular disk spins at high speed to merge the millions of individual optical paths into an aberration-free, high-clarity image.