sectioning mouse eyes - help

From:"Caldas, Hugo"

I have been struggling for a while so I thought I would seek advice/help
from histonet. 
I have formalin fixed paraffin embeded mouse eyes I am trying to section on
a Leica microtome at 4-5 microns. I seem to almost invariably get a "hole"
where the lens should be as I get further down the eye, it just seems to
burst open (I know the lens hardens the older the mouse, but there have to
be ways of doing this).
Does anyone have any tricks, tips, advice, anything? I would like to
eventually perform immunohistochemistry on some of the sections and expect
to detect mostly in the lens, hence my dispair.



Hugo Caldas
Columbus Children's Hospital 
Columbus, OH

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