Common Mistakes : Glass

noun

.BAD: He wears an old-fashioned glasses which make him look intelligent
.GOOD: He wears old-fashioned glasses which make him look intelligent

: Glasses (= spectacles) is a plural noun
.I wear glasses just for reading
?Have you seen my glasses

.BAD: I have to vacuum the floors and clean the glasses of the windows
.GOOD: I have to vacuum the floors and clean the windows

.BAD: The sunlight poured in through the glasses of the bedroom window
.GOOD: The sunlight poured in through (the panes of) the bedroom window

: pane (or window-pane ) = a sheet of glass used in a window
.The two cracked panes will have to be replaced

.Note that pane and window-pane are rarely used. Their meaning is usually expressed by window