Hands freemagnifiersfor visually impaired

In the past, the sawtooth face of a commercially produced diffraction grating is the replica of a master grating. A thin synthetic-resin replica is stuck onto a glass sheet and coated with aluminum. The master was traditionally produced using a machine tool, but now the surface is formed by an ion beam or using laser beam photolithography. This photolithographic process produces gratings with fewer imperfections. This smoother surface reduces stray light (light at unwanted wavelengths) by significant amounts.

Before buying any magnifier it’s important to know the magnification strength you require and what you’ll be using it for.

JavaScript appears to be disabled in your browser. JavaScript must be enabled in order to utilise the full functionalilty of this website.

Magnifying glass

Handheld video magnifiers with speech have all the benefits of a handheld video magnifier with the addition of text-to-speech this means that information can be read aloud to you as well as being magnified. This is particularly useful if your eyes become fatigued when reading.

This guide helps you to determine the magnification level you require. Please follow the instructions on the guide for its correct usage.

Handheldmagnifier for low vision

Handheld electronic video magnifiers allow you to access information wherever you are; around the home, at the office, while shopping, in restaurants etc. They come in a variety of screen sizes, larger screens being better suited to those requiring higher levels of magnification. They all include rechargeable batteries & can also be used whilst charging.

The first diffraction gratings were often a row of slits which functioned as a transmission grating, as shown at left. Modern diffraction gratings are a reflective blazed grating type that has a sawtooth cross-section, as shown at right. As light that passed through an adequately fine slit is diffracted, so light reflected from an adequately fine sawtooth surface is also diffracted. There are 500 to 2000 serrations per millimeter.