Hemeralopia is also known as Day
Blindness (non-medical term)
and as Night Sight (not to be confused with "Night
Blindness")..
| Hemeralopia is the term used
to refer to comparatively good vision in poor light
but poor vision in good illumination. |
An alternative definition of Hemeralopia is "a
visual defect characterised by the inability to see as clearly in bright
light as in dim light".
Occurence:
Hemeralopia is usually congenital (meaning "present
since birth"). However, it may sometimes be acquired
(meaning occur in a person who did not have the condition previously),
for example if the cones
in the retina
are damaged or destroyed e.g. by disease.
See for comparison Night
Blindness.
More about Ophthalmology: This section includes short definitions
of many diseases, disorders, and conditions of the eyes and visual system.
For definitions of other terms in this category, choose from the list
to the left (but note that this is not a complete/exhaustive list).
Other related pages include the diagram
of the eye, and definitions
of parts of the eye, a description
of the human retina, and definitions
of parts of the retina, and the section of short definitions
of clinical and surgical procedures re. eyes and human visual system.
For further information see also our section of Books
about Ophthalmology. |
 |
This Section
is about
Diseases
and Disorders of the Eyes and Visual System.
To read about other diseases, disorders, or conditions of the eye and
human visual system, use the links on the left-side of this page.
|
