A patient may complain that an object appears larger or smaller than it actually is due to a number of conditions.

Causes of things looking larger than they really area (macropsia):

(1) exposure to a miotic agent

(2) spasm of accommodation

(3) use of excessive plus lenses


Causes of things looking smaller than they really area (micropsia):

(1) suboptimal accommodation

(2) atropine or scopolamine

(3) bolulism poisoning

(4) diphtheria

(5) presbyopsia

(6) use of excessive minus lenses

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