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.
Quarter Moon, captured by NASA astronauts. Image credit: NASA. You can have a first quarter moon, when the Moon is halfway between a new moon and full moon. A new moon occurs when the Moon is directly in between the Sun and the Earth. From that perspective, the illuminated Moon is facing away from the Earth.
A Primary Moon Phase. Full Moon is the 3rd of the 4 primary Moon phases which occur at specific moments in time. The other 3 are New Moon, First Quarter Moon, and Third Quarter Moon. In addition, there are 4 intermediate phases which take up the time in between the primary phases.