Refraction and muscular imbalance, as simplified through the use of the ski-optometer

by Daniel Woolf

Suppression of Image

All deviations should be and probably are primarily associated with diplopia. Yet in the great majority of cases of established squint, especially convergent squint, there is no double vision. This is due to the mental suppression of the image by the squinting eye. In such cases all attempts to evoke diplopia by our tests may be futile, the patient not appreciating the presence of double images even when they are widely separated by prisms. Moreover, this suppression usually persists after the squint is cured, so that even though there are two retinal images of the same object, the mind perceives but one and ignores the other, just as though it were not present. In this case there is no true stereoscopic, or solid, vision.