Introduction

Non optical devices can be grouped according to their function

Enhances the images and reduces glare

Typoscope. A typoscope (pictured) assists in finding and keeping the place on a page of print

Enhances contrast

felt-tipped pens good lighting on object or print bold lined paper writing guide

Adjusts or provides a comfortable working distance

• reading stand
• good reading technique

Changes to environment

control or adjust light/glare with hat, eye shade or lamp, sunglasses organise space with less clutter change of person to subject ratio