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 First Quarter Moon. This First Quarter Moon is in the Northern Hemisphere and mirrors approximately the calendar symbol. Â©iStockphoto.com/Piergiov. 50% Illuminated. The First Quarter Moon is often called a Half Moon because we can see exactly 50% of the Moon's surface illuminated. Sun Lights Up the Moon