Red-feathered birds suffer from eye damage Birds with red,
orange or chestnut feathers are more likely to suffer from eye
damage, researchers have found. Scientists discovered the link
after analysing the lenses in the eyes of 81 different species
of bird. Birds known for their bright flashes of colour, such as
robins, were found to be more prone to cataracts. Dr Ismael
Galvan from Paris-Sud University, who led the study, said the
results could have implications for other species, including
humans. A cataract is when the clear lens of the eye becomes
cloudy, limiting the passage of light and affecting vision.
Bird's eye facts - Vision is cited as the most important sense
for birds; it is essential for flying - The ostrich has the
largest eye in the bird world. Measuring up to 5cm across, it is
also the largest eye of any land animal - Birds of prey have
specialised eyes to allow them greater peripheral vision and
super-sharp focus - Birds have much more complex colour vision
than humans and can see UV light "