Zeitschrift für klinische und experimentelle Ophthalmologie
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How commonly one-eyed patients use monocular cues: A survey at Tertiary eye care hospital

Naveen Kumar Challa*, Amrin Adil

Aim: The main aim of the study is to find out whether one-eyed patients use all pictorial monocular cues successfully in their day to day activities.

Methods: A pilot study was conducted on seventeen one-eyed subjects with a mean age of 47.23 yrs. ± 19.10 yrs. Subjects were given a forced choice questionnaire that consists of questions that would evaluate the use of all pictorial monocular cues in day to day activities. Each question has one right answer that is randomized and would fit with the use of the pictorial monocular cue. We determined whether a subject chooses the right answer for each question. Based on the answers we determined the number of pictorial monocular cues used by each subject.

Results: Results show that none of the subjects use all the monocular cues and two subjects did not even use one pictorial monocular cue. One-eyed patients commonly used pictorial monocular cues are relative size and texture gradient (47%), followed by aerial perspective (41%), motion parallax (35%) and linear perspective (35%). The least used monocular cue is interposition (12%). We also noted adaptation period and age (above 18 years) have no effect on the use of monocular cues.

Conclusion: Most one-eyed subjects are not aware of the existence of monocular cues that can be used to perform their day today activities successfully which will emphasize the fact that these patients needs counseling on awareness and use of the monocular cues to perform better in their routine day to day tasks.