My sister is experiencing itchy eyes and memory problems (quality: difficulty remember distant past events, difficulty remembering recent events). The following also describe her: Watery eyes, Feeling depressed, Trouble sleeping, Red or bloodshot eyes,

Itchy eyes. The eye symptoms are most likely related to allergies (itchy) and tear film insufficiency (the tearing). The redness can be from both. She should use lubricating eye drops and topical antihistamines. The memory problems are probably not related to the eye problems.