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.
The first quarter (waxing half moon) will have the shape of a lowercase N when it rises and a lowercase U when it sets. The last quarter (waning half moon) will look like a lowercase U when it rises and a lowercase N when it sets. Both the waxing and waning crescent moon phases will look like a smile.