Stargazing often involves conversation about celestial objects, but perceptual differences such as visual acuity can cause misalignments in what participants see, making communication difficult. As a preliminary investigation, this study examined how visual acuity differences influence conversational behavior during collaborative stargazing. In a VR-based constellation search task, we compared pairs with matched and unmatched acuity. Although results were not statistically significant, consistent trends emerged: more clarification requests, higher question frequency, and longer response latency under acuity differences. These findings suggest that perceptual asymmetry may affect mutual understanding and point to the potential of conversation-based support systems.