#dark adaptation

• Adaptation — A specialized term used as a variant for the adaptation process, designating the set of structural, physiological, or behavioral modifications through which an organism or organ adjusts to variations in environmental factors. In sensory physiology, the term describes the decrease or increase in a receptor's sensitivity (such as visual adaptation to darkness) in response to the intensity of prolonged stimulation.
• Adaptometry — A clinical method of investigation and diagnosis used in ophthalmology to determine the eye's capacity (specifically the retina's) to adapt to variations in light and darkness. This medical procedure measures the absolute light sensitivity threshold of visual receptors over time, allowing the early identification of retinal disorders or hemeralopia (night blindness).
• Adaptometer — A laboratory apparatus used in ophthalmology and physiology to measure the speed and capacity of the eye to adapt to darkness or sudden variations in light intensity. The device projects precisely controlled light stimuli, enabling the determination of the retinal adaptation curve and the diagnosis of night blindness or other photoreceptor cell dysfunctions.