In the Optical Instruments Gallery we explore a range of sight testing devices and associated equipment used by the optometrist in a practice setting or in the research laboratory. There are instruments for refraction, surface examination of the eye and internal illumination. There are instruments for checking your existing spectacles or lenses and even some quite sophisticated chairs!
This section of the MusEYEum website is particularly important because many historic instruments are too large to display in our small exhibition rooms. We can still 'collect' them, however, by taking photographs, collecting instruction manuals or preserving the trade catalogues issued by the manufacturers. The museum can often identify mysterious pieces of equipment found by the public.
Note that the article 'A Brief History of Vision' has now moved to our Eye and Vision Gallery where you can find out about the most sophisticated optical instrument of all...the human eye itself.
First the patient needs somewhere to sit.
We check the power of their existing spectacles.
Look for the letters!
We measure rays of light as they are reflected by the retina.
The principal diagnostic test, examining the eye for disease.
Assessing the visual field.
Mapping the surface of the eye.
For examining the cornea and the interior of the eye.
Measuring the intraocular pressure.
Used in conjunction with the crossed cylinder.