Eyecup \Eye"cup`\, n. A small oval porcelain or glass cup, having a rim curved to fit the orbit of the eye. it is used in the application of liquid remedies to eyes; -- called also eyeglass.

Source: Webster's Revised Unabridged Dictionary (1913)
 

Eyeglass \Eye"glass`\, n.

1. A lens of glass to assist the sight. Eyeglasses are used singly or in pairs.

2. Eyepiece of a telescope, microscope, etc.

3. The retina. [Poetic]

4. A glass eyecup. See Eyecup.

Source: Webster's Revised Unabridged Dictionary (1913)