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Background: The purpose of this study was to investigate the difference of height cognition ability according to dominant or non-dominant eye. Methods: Forty one healthy adults (male: 19, female: 22, 22-43 years) participated in this study. Hole in the card test was performed to identify dominant eye. To figure out height cognition ability between dominant and non-dominant eye, we had subjects answer which point is higher or even on the monitor. Results: The Right answer on dominant eye was 8.15±1.44 point and the right answer on non-dominant eye was 7.56±1.55 point. There was a statistically significant difference between dominant eye group and non-dominant eye group (p<.05). Conclusion: We think that the dominant eye may be used for reliable diagnosis. In future study, investigate on relation between dominant hand and dominant eye and the difference of dominant eye and non-dominant eye when to palpation are required.