In reply
Drs Bayramlar and Ünlü correctly point out an error in the legend to Figure 4 in my article.1 The material in the body of the article is correct, but the legend incorrectly ascribed the figure depicting the Bietti method to the Simonsz/von Graefe method and vice versa. The authors obviously read my article more carefully than I had read the proofs, where I overlooked this error. This mistake has been previously recognized and a correction has already been published.1