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.
In between these four instantaneous phases, the moon is said to be in four transitional phases, which each last slightly more than a week. Waxing crescent comes after new moon, waxing gibbous follows first quarter, waning gibbous comes after full moon and waning crescent follows last quarter. A waxing moon is getting larger while a waning moon is shrinking. Most people are familiar with a crescent shape, but the word gibbous is not normally in most people's vocabulary. It is from a Middle English word for hump-backed but can also refer to a pregnant belly.