according to burton Malkiel's forward, what makes students glassy-eyed when confronted with the study of economics?

Burton Malkiel believes that most economists do not write well, therefore students become glassy eyed when studying texts of an economist.

Explanation:

In the foreword of the book "Naked Economics: Undressing the Dismal Science" by Charles Wheelan, Burton Malkiel noted that most economics can not write well and their texts rely mostly on algebraic manipulations and diagrams, only few economists can explain economic analysis in a simple way or show it's relevance in everyday life. Therefore students get glassy eyed when studying economics.