noun
1
BAD : He wears an old-fashioned glasses which make him look intelligent.
GOOD : He wears old-fashioned glasses which make him look intelligent.
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Glasses (= spectacles) is a plural noun: 'I wear glasses just for reading.' 'Have you seen my glasses?'
2
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.
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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 .
3
See PAIR 2 (↑ pair )