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The quantitative measure of the lowest intensity of light (the threshold) required to elicit a sensory response at a specific location on the retina. It is a critical metric in visual function assessment.
read more about retinal sensitivity ...Retinal sensitivity is measured in decibels (dB) during visual field testing (perimetry). A higher dB value indicates higher sensitivity (meaning the retina can detect dimmer light).
A decrease in retinal sensitivity (a lower dB value) indicates damage or dysfunction of the photoreceptors, the retinal cells, or the nerve fibers at that specific location.
Used extensively to track the progression of various retinopathies, including age-related macular degeneration (AMD), diabetic retinopathy, and most notably, the peripheral field loss associated with glaucoma.
It can be caused by localized cell death (scotomas), edema (swelling), inflammation, or chronic deprivation of oxygen/nutrients to the retinal layers.
No. The fovea (the very center) has the highest sensitivity, which then rapidly drops off towards the periphery of the retina.
Microperimetry is a specialized form of retinal sensitivity testing that uses an eye tracker to stabilize the patient's gaze, allowing for high-precision, point-by-point sensitivity mapping of the macula.