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.
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