Former navy veteran Gerry Clancy struggles to fully understand the pandemic because of his condition.
Jacqui Clancy says her 77-year-old dad is continually startled by the people he sees wearing protective masks.
Ms Clancy told BBC Radio Foyle: “It is distressing for him, which then makes it distressing for me.”
Every time Mr Clancy’s daughter explains why people are wearing masks or why he cannot shake their hands, he would understand initially.
But moments later she says she must try and explain the situation to him again.
Ms Clancy says she has struggled with her own mental health because of the situation.
“When caring for someone with dementia your care comes last,” Jacqui added.
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