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The desiccation or dehydration of the disc material is known as disc desiccation. Between each vertebrae of the spinal column are discs that have gelatinous material. This water-like substance acts as a cushion and a shock absorber. Desiccation of disc material is most common in elderly people and can happen anywhere in the spinal column from the top to the bottom.
The morphologic characteristics of the optic disc are routinely assessed to screen, diagnose, and monitor disease in conditions such as glaucoma and optic neuropathies. Of various optic disc features, the vertical cup to disc ratio (CDR) is the most commonly used clinical measurement, particularly for the diagnosis of glaucoma. 1 Systemic and ocular processes may affect the CDR, and understanding these factors may improve the clinical assessment of this sign.