Hey John...here is another angle. Jesus called the Laodicean church bishop blind....and that he needed to purchase eye salve from Him so that he might see.
Rev. 3:17 Because thou sayest, I am rich, and increased with goods, and have need of nothing; and knowest not that thou art wretched, and miserable, and poor, and blind, and naked:
18 I counsel thee to buy of me gold tried in the fire, that thou mayest be rich; and white raiment, that thou mayest be clothed, and that the shame of thy nakedness do not appear; and anoint thine eyes with eyesalve, that thou mayest see.
1. This is not about physical sight.
2. As a Christian leader he would already know the gospel.
So that leaves the deeper walk of faith that opens into spiritual life. That is what he is missing. And SO many people these days are fully unaware of.
Therefore Jesus is speaking of the spiritual faculty of seeing.
Just another reference to your OP. :)