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Visual Field values are logarithmic values !!!

Visual Field values are logarithmic values !!! The goal of this video is two answer two questions :

1. Whey when we examine same person using the Octopus vs the Humphrey visual field analyzer we get different dB values?
2. Why in early stages of glaucoma, damage is shown with OCT parameters rather than Visual field while in advanced stages visual field damage becomes more apparent?

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