Hello and thanks for your question.
I'm sorry to hear about your mother's predicament. The progression of cataracts, by itself, does not cause short-term memory loss or dementia. However, one of the biggest risk factors for the onset of dementia is poor vision. It has been documented that patients with dementia do much better in terms of their memory and functioning when the vision is optimized, and taking out cataracts and putting on the most appropriate glasses would likely help your mother out in this respect.
Does that make sense and does that help address your concerns?
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My opinion is solely informative and does not constitute a formal medical opinion or recommendation. For a formal medical opinion and/or recommendation you must be examined by your doctor.