5. Colorless specks in front of the eyes.
Such floaters are particularly visible against a background of clear skies, dazzling snow, or a well-lit white wall. From time to time, each of us sees them, but a sharp increase in their number should alert you: this may be a sign of a retinal tear or detachment.
6. Swollen red eyes.
This is a consequence of fatigue and lack of sleep and is often mistaken for a sign of infection.
Such a symptom can also appear in lovers of eye drops with a whitening effect. Their long-term use can do more harm than good.