Blepharitis, or eyelid inflammation, one of the most common problems, is characterized by erythematous eyelids with accumulation of debris along the eyelid margin. Malignant eyelid tumors may be associated with lash loss and erosion of normal eyelid structures.
Moon phases depend on the position of both the Sun and Moon with respect to the Earth. The 4 primary phases of the Moon are: new, first quarter, full and third quarter.
1. (Astronomy) the moon at first or last quarter when half its face is illuminated. 2. (Astronomy) the time at which a half-moon occurs. 3. a. something shaped like a half-moon. b. (as modifier): half-moon spectacles.