Psychologists use the Vividness of Visual Imagery Questionnaire (VVIQ), which asks you to rate different mental images, to test the strength of the mind’s eye.
Take the questionnaire here to test the strength of your mind’s eye:
The University of Exeter has also developed an abridged version:
The Vividness of Visual Imagery Questionnaire (VVIQ) was developed in 1973 by the British psychologist David Marks (Marks, 1973). The VVIQ consists of 16 items in four groups of 4 items in which the participant is invited to consider the image formed in thinking about specific scenes and situations.
The questionnaire has been widely used as a measure of individual differences in vividness of visual imagery. The large body of evidence confirms that the VVIQ is a valid and reliable psychometric measure of visual image vividness.