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Dr. Welsh's letter was referred to Dr. Boeder, who offers the following reply:
To the Editor:
—Dr. Welsh brands as misleading and inaccurate my statement that the so-called ring scotoma is "approximately 10°." This is not meant to be an accurate figure; it is an estimate which is to convey an idea regarding the magnitude of this blind region, and as such I can only reaffirm it. Nor does Dr. Welsh himself give an exact figure, but merely states that "This so-called scotoma is somewhat larger than 10° on the average...." Then, in the next sentence, he discounts the importance of an exact figure, stating, "Whether it is 10° or 18° is not the important factor...," and thus comes to his real objection to my little paper, namely that I omitted any reference to the "roving" of the ring scotoma to which he has given some special attention, and which
Boeder P. ROVING RING SCOTOMA-Reply. Arch Ophthalmol. 1963;69(5):686-687. doi:10.1001/archopht.1963.00960040691024