Read the passage.

when i consider how my light is spent
ere half my days, in this dark world and wide,
and that one talent which is death to hide,
lodged with me useless, though my soul more bent
to serve therewith my maker, and present
my true account, lest he returning chide;
“doth god exact day labor, light denied? ”

in sonnet xix by john milton, at what point did the speaker’s eyesight fail?

when he lost his talent
during his youth
in late spring
at midlife