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An Ocutech Product

Aids For Tunnel Vision

Visual field expanding aids make images smaller to enable individuals with tunnel vision from Retinitis Pigmentosa (RP) and other visual disorders to enhance their peripheral field awareness to travel more safely and to locate objects beyond their normal field of view.

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IM.demo .2017

Ocutech Field Viewer

The Ocutech Field Viewer (FV) (0.25x) is a concave lens that is held at arm’s length and used as an aid in mobility and in other visual activities. It functions by reducing the image size, in effect, placing more visual information into the visual field. It reduces the image size by 75%.


Ocutech Image Minifier

The Ocutech Image Minifier (IM) produces a very sharp 50% reduced image (0.5x) without barrel distortion. It can be ordered with a neckstrap and used handheld by holding it close to the eye, or it can be ordered attached to eyeglasses. The wide rear lens allows the user to scan their visual environment while looking through the device. It is also available mounted in a trial ring for demonstration purposes. The IM chassis allows for fine focus of the device by simply loosening the set screw with the Allen wrench to the front and back of the IM in and out until the image is clearest for the user.


Ocutech Field Expander

The Ocutech Field Expander (FE) (0.5x) is a smaller and lighter version of the Image Minifier that reduces the image size by 50% without distortion. It is designed to attach to eyeglasses using one of several prescribing options below. It is also available mounted on a demonstrator clip for testing purposes.

Ocutech InstaMount: Attached to the front of the eyeglass lensor magnetic clip frames using self-adhesive flanges.

Instamount FE w flange unmounted

Ocutech Reveal: Traditional through-the-lens mounting system.

Reveal TS

Ocutech SightScope Flip: Frame Mounted System: Adjustable flip-up mountings used with Ocutech metal frames.


Ocutech SightScope Flip: Patient Clip-on System: Completely adjustable system works on many frame styles.

Field Expander on Patient Clip

Demonstrator Clip: Convenient method for testing and demonstration.

SiSc FE demo clip

Important Resources

Tunnel Vision Products Brochure

Image Minifier / Field Viewer Guide

IM / FV / SightScope Field Expander PDF Order Form

Online Order Form

Instructional Video