The Visual Field

Oct 28, 2016 by in OPHTHALMOLOGY Comments Off on The Visual Field

(1) University of Sydney, Sydney, Australia   Overview The visual field is the portion of space visible to a single stationary eye. The normal visual field extends 90° temporally, 70°…

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Contrast Sensitivity

Oct 28, 2016 by in OPHTHALMOLOGY Comments Off on Contrast Sensitivity

(1) University of Sydney, Sydney, Australia   Overview: Relevance of Contrast Sensitivity to Daily Function 1. Contrast sensitivity and visual function Contrast is a measure of the lightness or darkness…

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The Retina

Oct 28, 2016 by in OPHTHALMOLOGY Comments Off on The Retina

(1) University of Sydney, Sydney, Australia   Structure and Development Overview The retina is a highly specialized neural tissue that converts light into neural signal. It lines the inner surface…

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Temporal Properties of Vision

Oct 28, 2016 by in OPHTHALMOLOGY Comments Off on Temporal Properties of Vision

(1) University of Sydney, Sydney, Australia   Overview 1. The visual system in a changing environment The visual system responds to variation in light over time, allowing instantaneous interpretation of…

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The Lens and Accommodation

Oct 28, 2016 by in OPHTHALMOLOGY Comments Off on The Lens and Accommodation

(1) University of Sydney, Sydney, Australia   The Lens Overview 1. Structure The lens is a biconvex, transparent structure located behind the iris (Fig. 4.1). Fig. 4.1 The lens and…

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The Primary Visual Cortex

Oct 28, 2016 by in OPHTHALMOLOGY Comments Off on The Primary Visual Cortex

(1) University of Sydney, Sydney, Australia   Overview The primary visual cortex (V1) receives visual information from segregated magnocellular, parvocellular, and koniocellular channels of the lateral geniculate nucleus (LGN) [1,…

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Luminance Range for Vision

Oct 28, 2016 by in OPHTHALMOLOGY Comments Off on Luminance Range for Vision

(1) University of Sydney, Sydney, Australia   Overview 1. Mechanisms that broaden our luminance range for vision Our visual system can function over a wide range of light intensities, from…

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Visual Electrophysiology

Oct 28, 2016 by in OPHTHALMOLOGY Comments Off on Visual Electrophysiology

(1) University of Sydney, Sydney, Australia   Overview Visual electrophysiology is the recording of electrical signals produced by the visual system. It allows assessment of the entire visual pathway, from…

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Visual Acuity

Oct 28, 2016 by in OPHTHALMOLOGY Comments Off on Visual Acuity

(1) University of Sydney, Sydney, Australia   Overview Visual acuity (VA) is a measure of keenness of sight. It is a relationship between the size of a stimulus and visual…

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