When i consider how my light is spent  ere half my days, in this dark world and wide, in these lines of verse from sonnet xix by john milton, how does the speaker’s way of identifying this point in his life emphasize the despair he feels?

The poem emphasizes the desperation that the author felt for having been blind for half of his life and for this reason, he feels that his life is meaningless.

Explanation:

This sonnet deals with the loss of vision that the poet suffered, a pitiful fact for those who have poetry as art, a circumstance that made him practically dependent on a third party, who collected his words.

In this poem he uses the word "light" as a metaphor for vision, so when the author speaks "When I consider how my light is spent" he is speaking of his worn out vision and this left the rest of his days a world dark and wide.

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