You could keep track and take pictures every month or so - I find this really interesting and I learn a lot by just comparing the images.
With your fish I‘m also interested how more experienced members or breeders will ”judge“ him🤗.
FWIW, I don't really worry about Dragons. I've had too many to count over the years and not a Diamond Eye or tumor in the bunch. I wonder if the percentage is really that high considering only those whose Dragons have the problem comment.
I've also seen damage and cataracts diagnosed as Diamond Eye... even in non-Dragons.