other vague double vision swollen prostate gland weird sleeping habits

My old mother and father (age ###) HEALTH, STRENGTH, ENERGY, POSITIVITY, OPTIMISM, LONGEVITY, VITALITY, SOUND MIND (no dementia, confusion, childishness, arrogance, stubbornness...). My father - ### - skin tumors, one eye almost blind, the other vague/double vision, swollen prostate gland, weird...