United Kingdom, Sept. 11 -- Bruce Willis' wife can determine his needs from looking into his eyes.

The Die Hard star's ability to communicate has been severely impacted by his frontotemporal dementia (FTD) but Emma Heming Willis has learned to read his body language to make "judgement calls" about anything that is bothering her husband.

In an extract from her book The Unexpected Journey: Finding Strength, Hope, and Yourself on the Caregiving Path shared by Us Weekly, Emma wrote: "Because Bruce can't communicate with me (due to the variant of FTD he has, primary progressive aphasia), I must make judgment calls for him about absolutely everything.

"I can't ask him how he's feeling, what's wrong or if something hurts.

"Instead, I read hi...