Which method can be used to test for the presence of eccentric fixation?

Visuoscopy is a valuable technique used to detect eccentric fixation by allowing for a direct observation of the fixation point in relation to the fovea. During visuoscopy, a target is presented to the patient, and the examiner uses a special device to project the image onto the retina. By observing the position of the reflected image of the patient's fixation point, the examiner can determine whether the patient is fixating eccentrically rather than at the fovea. This method provides a clear visual representation of any deviations from normal fixation and helps to confirm the presence of eccentric fixation.

Other methods, such as the Hirschberg test and Bruckner test, are useful in assessing strabismus and determining alignment but do not provide the specific details needed to diagnose eccentric fixation. Binocular versions can assess eye movement and coordination but do not specifically test for eccentric fixation. Thus, visuoscopy stands out as the most effective method in this context.