There are many paper that report brain damage in glaucoma. In fact glaucoma has recently been proposed to be a brain specific diabetes (Diabetes type 4). There are two groups working on it; the Neeru Gupta group in Canada and our group:

Here are some papers for you:

Article Glaucoma – Diabetes of the brain: A radical hypothesis about...

https://www.ncbi.nlm.nih.gov/pubmed/28176628

Article Synthesis of novel triazolothiadiazines and triazolotetrazin...

Regarding the part of your question about diagnosing glaucoma by sectioning the brain. The answer is "Yes". Glaucoma can be diagnosed that way also. studies have shown that the glaucomatous damage is not restricted to eye only. THe optic nerve, the chiasm, the lateral geniculate nuclei as well as the primary visual cortex are involved. A classical paper by Dr. Neeru Gupta "What changes can we expect in the Brain of Glaucoma Patients" will be useful read to you.

Hope this is useful

Sir..Thanks for the information given in a clear manner. Gained knowledge from your answer and will go through the papers you added. Thanku once again.

You are welcome. If you require the full text, please let me know.

Best wishes

Moneeb, if you please send me the full text and thanks for your answer