Half of adults in Wales unaware of this dementia symptom
Dementia can affect vision by causing problems with judging distances, perceiving object edges, and misinterpreting patterns or reflections.
It can also make reading large text difficult and cause issues with recognising objects.
The charity's research also found that one in ten people could not name a single common symptom of dementia.
Alzheimer's Society Cymru wants to raise awareness of the six most common symptoms of dementia during Dementia Action Week, which runs from May 19 to 24.
These symptoms are memory loss, difficulty organising thoughts, communication problems, vision issues, confusion about time or place, and mood or personality changes.
Rachel Nelson, country manager at Alzheimer's Society Cymru, said: "At Alzheimer's Society, we see too many people delaying seeking a dementia diagnosis because they're scared or unsure what it will mean.
"A diagnosis is not the end.
"It's the beginning of getting the right support, making informed choices, and living well."
Corinne Mills, interim CEO of Alzheimer's Society, added: "This Dementia Action Week, we're highlighting the six most common symptoms of dementia and encouraging anyone with concerns to use our free symptom checklist and seek help from their GP or other health professional."
If you're worried about yourself or someone close to you, visit the Alzheimer's Society website or call Alzheimer's Society's Dementia Support Line on 0333 150 3456.
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