Turner and his sight

Snow Storm-Steam-Boat off a Harbour's Mouth making Signals in Shallow Water, and going by the Lead. The Author was in this Storm on the Night the Ariel left Harwich, about 1842.

I am captivated by Turner's "late" works, which commentators characterize as bordering on the abstract.

After viewing the current exhibit "Tuner's Modern World" at the Museum of Fine Arts Boston, a friend pointed me to the 1872 article in Nature, "Liebreich, 1872, Dr. Liebreich on Turner and Mulready" (https://www.nature.com/articles/005404a0). The lecturer proposed that beginning about 1830, Turner's vision was increasingly affected by astigmatism, lens yellowing, and cataracts.

So, rather than Turner perceiving a new, abstract reality, is it that he continued to portray what he saw accurately, almost photographically?