Poor eyesight...is it biological or is it spiritual? Perhaps both...you decide. Comparing means to examine and to determine the similarities and/or differences of two or more things, ideas, or persons. People have a tendency to compare themselves with other people. When we compare ourselves with others, it may be a form of jealousy and can lead to envy and discontentment. This type of comparison is not wise according to the scriptures. This SIN sprouts from a root of a failure to trust in the Lord's love and fairness to us.

1 Samuel 18:8-9 KJV...

 And Saul was very wroth, and the saying displeased him; and he said, They have ascribed unto David ten thousands, and to me they have ascribed but thousands: and what can he have more but the kingdom?

9 And Saul eyed David from that day and forward

Romans 9:20-21 KJV...

Nay but, O man, who art thou that repliest against God? Shall the thing formed say to him that formed it, Why hast thou made me thus?

21 Hath not the potter power over the clay, of the same lump to make one vessel unto honour, and another unto dishonour