1982 Cambridge Easy Reader, a
simple reading mask. (Engineering and Design Plastics,
1985 Pill container for the elderly.
(W&W Medsystems)
1988 Cambridge Low-Contrast Gratings,
an inexpensive clinical test of contrast sensitivity. (Clement Clarke
International, Harlow)
1992 Intuitive Colorimeter, a
device for precision ophthalmic tinting. (Cerium Visual Technologies,
Tenterden)
1992 Precision Tints, a set of
tinted trial lenses. (Cerium Visual Technologies, Tenterden)
1995 Intuitive Overlays, a set of
coloured filters for use in the classroom and optometric clinic. (I.O.O.
Marketing Ltd.,
1996 Rate of Reading Test, a test
for visual aspects of reading difficulty. (I.O.O. Marketing Ltd.,
2001 Institute of Optometry Near Test
Card, a near test card that involves reading randomly ordered common words,
with Dr B.J.W. Evans. (I.O.O. Marketing Ltd.,
2002 Pattern Glare Test, a simple
test for the assessment of spatial aspects of photophobia (I.O.O. Marketing)