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Lab Essentials, Inc.


ISIS Expanded Pupil Eyepieces
manufactured by Vision Engineering


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At the end of a long day, which would you prefer--the view through conventional microscope eyepieces or the view through the revolutionary new ISIS expanded pupil eyepieces?


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ISIS is a breakthrough patented accessory for use with conventional binocular eyepiece microscopes.

ISIS dramatically reduces eyestrain and allows the operator freedom of head position. The unmatched eye distance of 38mm allows, for the first time, prescription eyeglasses to be worn in complete comfort, with common weaknesses (long and short sight, astigmatism) no longer affecting user efficiency. Throughput and accuracy are enhanced, despite prolonged periods of microscope use.



Slides into the eyepice tubes of existing binocular microscopes

Can be used with stereo, compound momo, infinity corrected or finite, upright or inverted microscopes of most leading brand names

Titting takes 60 seconds and is easily carried out by the user

Can be used with camera adapters, trinocular heads, and other accessories

Improves the optical performance of most stereo and mono microscopes at all magnifications from 6x - 1200x

Works well with biological, metallurgical and oil immersion objectives

Can be used with a variety of illuminators including: polarization, fluorescence, bright/dark field, Normarski, phase contrast, etc.

Technical Specifications

Dual ISIS eypieces with rotating multilenticular disks for exit pupil expansion

Powered by 12v DC transformer (all international variants available) with dual LED power indicators

Eyepiece magnification extending lenses of 10x, 15x, 20x available (10x is standard)

A range of standard and customized graticules may be fitted to either eyepiece and rotated

Straightforward controls provide eyespacing, operator diopter setting, and parfocality adjustment

Unpacked weight:  3 lbs
Packed weight: 5 lbs




How It Works
The patented ISIS accessory deploys Vision Engineering's award-winning Expanded Pupil (EP) Technology and simply fits in place of the traditional eyepieces on mono, routine, research, and stereo microscopes.

ISIS offers an exit ray bundle twelve times larger than a conventional eyepiece, permitting a greater freedom of head movement shich reduces fatigue and additionally increases the distance between the user's eyes and the eyepiece by a factor of four. The Expanded Pupil image is generated by a pair of tiny multifaceted transfer disks; one 83mm diameter disk for each eyepiece. Their surfaces contain over 2 million individual linticules (lenses) and spin at high speed to merge the millions of individual optical paths, delivering an aberration-free, high-clarity image.

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ISIS overcomes the usual requirement for users to precisely align their eye with the center of each eyepiece.

Conversely, conventional eyepieces have a narrow exit ray bundle, so users are required to precisely align their eye with the center of each eyepiece. Typically, a slight movement of the eye results in loss of part of the field of vision as the pupil moves beyond the narrow conventional ray bundle.

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Information & Ordering
Currently, ISIS is designed to fit most microscopes with 30mm diameter eyepiece tubes, but will shortly be compatible with microscopes with 23mm diameter eyepiece tubes.

ISIS fits most well-known other-brand microscopes, with the number of compatible systems constantly increasing as Vision Engineering continues their development process. To find out how ISIS can be retrofitted to your current microscope, please contact Lab Essentials, Inc. at 1-888-522-7226. We will need your microscope manufacturer and model number.

Images and text copyright 2000 Vision Engineering. Used by permission.
Please visit Vision Engineering's website at