Tonya Conner is a 41-year-old female who presents for her annual exam. The nurse asks Tonya about any problems she is having with reading. Tonya replies that she feels like she is having trouble seeing things at night, and her vision is not as good as it used to be. The nurse performs a Snellen exam, and Tonya is unable to correctly read the row of numbers that is on the 20/20 line. What is the most likely diagnosis associated with these results?
A) Ptosis
B) Accommodation
C) Nystagmus
D) Myopia
