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 First Quarter is when half of the waxing or growing moon is visible because the Sun is shining only on half of the hemisphere that is visible from Earth.  Full Moon is when the moon appears to be a complete circle because the Sun is shining directly on the entire visible hemisphere.