Monocular Diplopia

Binocular diplopia, due to deviation of the eyes or to prisms, must be distinguished from monocular diplopia, or the condition in which the patient sees double with one eye alone. This occurs as the result of astigmatism, plus spherical aberration and other conditions found occasionally in squint. It can readily be differentiated by the fact that binocular diplopia disappears when the patient shuts either eye; while monocular diplopia, of course, does not.

TABLE OF DIPLOPIA

Name of
diplopia		Image of
right eye as
compared
with that of
the left is		CAUSED BYCORRECTED BY
(1) By a natural
deviation of		(2) Artificially
by a prism
placed, base		(1) Turning(2) Prism placed
with base
Lateral HomonymousOn the
right		Either eye inward
(esophoria,
esotropia.)		In before either
eye.		Both eyes outward
(divergence.)		Out before either
eye.

Heteronymous
(or crossed)		On the
left
Either eye outward
(exophoria,
exotropia.)
Out before either
eye.
Both eyes inward
(convergence.)
In before either
eye.
Vertical
Right		BelowRight eye up
or left eye down
(right hyperphoria,
right hypertropia,
left hypotropia.)		Up before right
eye, down before
left eye.		Right eye down
and left eye up
(left supravergence.)		Down before right
eye or up before left eye.
Left
Above
Right eye up
or left eye down
(right hyperphoria,
right hypertropia,
left hypotropia.)
Up before right
eye, down before
left eye.
Right eye up and
left eye down
(rightsupravergence.)
Up before right
eye or down
before left.