Does a symbol for glasses exist?

Here is a TikZ solution.

\documentclass{article}
\usepackage{blindtext}
\usepackage{tikz}

\newcommand{\glasses}{\resizebox{3em}{!}{%
\tikz{\draw(0,0) coordinate (Origin) --++(0.2,0) coordinate (endL) arc (180:0:0.05)--++(0.2,0) coordinate (endR) --++(45:0.25) arc (180-45:0:0.08) (endR) arc (0:-180:0.1) (endL) arc (0:-180:0.1) (Origin)--++(45:0.25) arc (180-45:0:0.08);
}}}

\begin{document}
\noindent
\glasses\ \textsc{Attention}. \blindtext
\end{document}

\documentclass{article}
\usepackage{tikzducks}

\begin{document}

\tikz{\duck[invisible,squareglasses]} 

\tikz{\duck[invisible,glasses]} 

\tikz{\duck[invisible,sunglasses]}  

\end{document}

The unicode character EYEGLASSES, code U+1F453

seems to be what you are looking for.