The definition of a biennium is a period of two years. Your two-year cell phone contract is an example of a biennium. noun.
Symptoms of vestibular neuritis are characterised by a sudden onset of a constant, intense spinning sensation that is usually disabling and requires bed rest. It is often associated with nausea, vomiting, unsteadiness, imbalance, difficulty with vision and the inability to concentrate.
The main symptoms of Optic Neuritis are: 1  Loss of visual acuity (blurring of vision) which occurs in around 58% of ON cases. 2  This can range from mild blurring of vision in 34% of cases, through moderate loss of acuity (12%), to severe or total loss of light perception (complete blindness) in 54% of cases.