Jumping Letters: The Mystery of “Map Dot Fingerprint Dystrophy” From person to person, reading can prove difficult for a huge variety of reasons. The most obvious would be refractive errors such as hyperopia (long-sightedness), presbyopia, and astigmatism. However, other conditions such as dyslexia, can also significantly affect how accurately an individual can decipher the letters on a page. Another, lesser-known condition that can affect your ability to clearly discern letters is Map Dot Fingerprint Dystrophy (MDFD). What is Map Dot…