aphantasia
noun
aph·an·ta·sia ˌa-ˌfan-ˈtā-zh(ē-)ə 
: the inability to form mental images of real or imaginary people, places, or things
Derek has a condition called aphantasia, which means he is unable to voluntarily produce mental imagery.
Brooke McAfee
Brooke McAfee aphantasic
ˌa-ˌfan-ˈtā-zik
adjective 
Word History
Etymology
a- entry 2 + Greek phantasía "appearance to the consciousness, imagination" — more at fantasy entry 1
Note: The term was introduced by Adam Zeman, et al., "Lives without imagery—congenital aphantasia," Cortex, vol. 73 (December, 2015), pp. 378-80.
First Known Use
2015, in the meaning defined above
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