The expression "eye of mind" can be used to describe the imagination, insight, or perception of a person. There are many synonyms that can be substituted for this phrase, depending on the context and intended meaning. For example, "mental imagery," "mental acuity," and "intellectual keenness" could all be used to describe the ability to visualize something in the mind's eye. Alternatively, "insightfulness," "discernment," or "perspicacity" might be used to describe someone's ability to perceive the essence of a situation or problem. Ultimately, the choice of synonym will depend on the intended connotation and context of the phrase "eye of mind".