When a snake is in blue,or about to shed, the eyes will be a milky grey blue color. they will clear up after a few days and shedding will take place 3-5 days later. I like to soak my snakes in shallow luke warm water for 30 mins the day the eyes are cleared up and usually they shed within 24-48 hours. Hope this helped.
It almost looks like a retained eye cap (one that did not come off during the last shed). I can't be for certain though. What is the humidity in his enclosure?
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1.1 Normals - Apollo & Medusa
1.0 Pastel - Zeke
0.1 Pastel het OG - Dixie
0.1 Pastel het Axanthic
0.1 Spider het Axanthic
1.1 Mojave - Clyde & Bonnie
1.0 Black Pastel - Conan
0.1 Spider - Dizzy