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“The obvious lack of this infinite light from space is known as Olbers’ paradox. There are various ways to explain why the night sky is not infinitely bright, but the Big Bang explanation is perhaps the most convincing. If the universe was created just a few billion years ago, then the starlight would only have had enough time to reach us from a limited volume of space, because light travels at only 300 km/s. In short, a finite age for the universe and a finite speed of light results in a night sky with only a finite amount of light, which is what we observe.” (
Optic nerve drusen are acellular laminated concretions of unknown aetiology that are found within the substance of the optic nerve head. Most patients with optic nerve head drusen are asymptomatic. However, peripheral visual field defects can be detected in nearly three quarters of eyes with optic nerve head drusen. Investigators from the University of Utah evaluated 58 eyes of 41 patients with buried optic nerve head drusen. They conclude that visual field defects are uncommon in eyes with buried optic nerve head drusen. Eyes may have focal nerve fibre defects but have normal average retinal nerve fibre thickness. The authors suggest that in patients with buried …
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