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The 49 pages that link to Visual acuity, each with the reason it gives.

• RetinaRelated: The foveal arrangement of retinal cones largely determines high-acuity vision.

• Light pollutionRelated: Appropriate lighting can support seeing, while glare from excessive lighting can reduce it.

• Visual perceptionRelated: It sets a limit on the detail available to perception.

• Cone cellRelated: Dense, individually connected cones in the fovea help produce high visual acuity.

• Depth of fieldRelated: Viewing distance and eyesight help determine what counts as acceptably sharp.

• Visual fieldRelated: Acuity changes across the visual field, generally falling away from fixation.

• CataractRelated: Cataracts can make details harder to resolve, lowering measured acuity.

• PsychophysicsRelated: Threshold procedures quantify the smallest visual details that can be resolved.

• BlindnessRelated: Reduced acuity is one route to functional blindness, even when some sight remains.

• AccipitridaeRelated: Sharp vision helps many accipitrids detect prey from flight or distant perches.

• Refractive errorRelated: Uncorrected refractive error often reduces measured distance or near acuity.

• Spatial frequencyRelated: High-frequency patterns probe the finest detail that vision can distinguish.

• AmblyopiaRelated: Reduced acuity in one or both eyes is the defining functional finding in amblyopia.

• PupilRelated: Pupil diameter can affect image sharpness, but acuity is a distinct visual measure.

• Rod cellCompared with: Convergence in rod pathways sacrifices spatial resolution compared with cone-rich central vision.

• EyeglassesRelated: Eye examinations measure acuity to assess vision and corrective needs.

• OphthalmologyRelated: It is a basic measure of visual function in eye examinations.

• Photopic visionRelated: Dense foveal cones allow photopic vision to achieve high spatial resolution.

• Visual literacyCompared with: Seeing details clearly is different from interpreting what visual forms mean.

• PresbyopiaRelated: Near acuity may decline even when distance acuity remains good.

• AstigmatismRelated: Astigmatism may reduce measured acuity when it is uncorrected.

• Fovea (retina)Related: The fovea provides the retina’s highest visual acuity.

• VisibilityRelated: Recognition depends on resolving an object's details, not merely detecting its light.

• Low visionRelated: Acuity is one measure used to describe the severity and pattern of low vision.

• Optical mixingRelated: Reduced acuity makes separate colored marks merge at shorter viewing distances.

• Visual field testCompared with: Unlike acuity testing, field testing measures vision across many locations.

• AlbinismRelated: It helps assess the functional effect of foveal and optic-pathway development in albinism.

• Depth perceptionRelated: Clear spatial detail supports judgments based on edges, texture, and disparity.

• Peripheral visionRelated: Peripheral acuity declines with distance from the point of gaze.

• Tear filmRelated: An uneven tear surface can blur the first refracting interface of the eye.

• AchromatopsiaRelated: Cone impairment can reduce fine-detail vision as well as color discrimination.

• Night visionRelated: Dim-light sensitivity comes with reduced sharpness because rods are less densely arranged centrally.

• Optic neuritisRelated: Visual-acuity testing quantifies one part of the impairment and its recovery.

• PhotophobiaCompared with: Visual acuity measures sharpness, while photophobia describes discomfort from light.

• Cataract surgeryRelated: Improvement in visual acuity is a principal outcome, though it depends on more than lens clarity.

• Visual systemRelated: It provides a practical measure of the system’s fine-detail performance.

• Optical telegraphRelated: Observers had to distinguish small differences between signal positions, often at great distance.

• Pixel densityRelated: It helps explain when individual display pixels become indistinguishable.

• Visual agnosiaRelated: Adequate acuity helps rule out blurred input as the explanation for recognition failure.

• LASIKRelated: LASIK aims to improve uncorrected acuity, but outcomes vary and do not guarantee perfect vision.

• OptometryRelated: Acuity testing gives an initial measure of how clearly a person sees at different distances.

• EyeRelated: Retinal sampling and optical focus set limits on image sharpness.

• Visual impairmentRelated: Reduced acuity is one major form of visual impairment, distinct from losing peripheral vision.

• Tyrant flycatcherRelated: Spotting small, moving prey from a perch depends on effective visual detection.

• Human eyeRelated: It tests the sharpness of images formed and processed by the visual system.

• Jan Evangelista PurkyněRelated: Purkyně developed an early system for comparing visual sharpness.

• MicrophthalmiaRelated: Testing it helps establish the functional effect of microphthalmia.

• MonochromacyRelated: Cone dysfunction can reduce sharpness independently of monochromacy's loss of color.

• Haidinger's brushRelated: The brush's visibility depends on central vision and can be explored alongside acuity.