I've been giving my dad a year of mourning, and the eyeglass frames are red, so do I need to change them?

No. In traditional Chinese culture, wearing filial piety refers to the act of wearing plain clothes and filial ornaments for a certain period of time after the death of a loved one in order to express condolences and respect. Among them, filial piety ornaments usually include wearing black veils, white flowers, hemp ropes, etc. to express the mourning. The color of the eyeglass frames is not the key to wearing filial piety, so even if the eyeglass frames are red, it will not affect your sincerity and expression of wearing filial piety for your father.