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Jun 17, 2020 · Visual acuity (VA) and contrast sensitivity (CS) characterize different aspects of visual function. 1 In everyday activities, the ability to resolve fine details, often measured by VA, is critical to pattern recognition, such as reading small print, 2, 3 whereas the ability to distinguish an object against its background, often measured by CS ...
- 10.1167/iovs.61.6.40
- 2020/06
- Why Is Good Contrast Sensitivity Important?
- What Situations Require Contrast Sensitivity?
- Symptoms of Reduced Contrast Sensitivity
- Contrast Sensitivity vs. Visual Acuity
- How Is Contrast Sensitivity Measured?
- Summary
Contrast sensitivity is an essential measure of visual function. It’s necessary to have good contrast sensitivity for different reasons, such as:
Common situations that require contrast sensitivity include: 1. Driving at night, in the rain, or in fog 2. Locating objects against a similarly colored background 3. Reading material with poor contrast, such as a newspaper 4. Stepping off curbs or steps 5. Distinguishing facial features of others
It’s essential to have contrast sensitivity in many low-contrast situations. People with reduced contrast sensitivity may experience: 1. Poor vision while driving at night 2. Difficulty seeing curbs and steps 3. Eye strain from watching TV or reading 4. Images that appear washed out 5. Inability to identify the food on their plate
You may confuse contrast sensitivity with visual acuity. Both terms refer to how well you can see details. However, contrast sensitivity measures two variables, size and contrast, while acuity measures only size. Testing for contrast sensitivity and visual acuity is also different. The test measures how well you can distinguish between light and da...
Contrast sensitivity is measured in units called log contrast sensitivity units. The lower the score, the poorer the contrast sensitivity:8 1. A score of 2.0 indicates normal contrast sensitivity 2. A score of 1.52 to 1.76 for individuals over 60 years of age 3. A score of 1.72 to 1.92 for individuals younger than 60 years
Contrast sensitivity refers to how well you can perceive objects against their backgrounds. It affects your ability to drive safely, read, and perform other tasks. Poor contrast sensitivity can lead to serious accidents. To improve contrast sensitivity, schedule an appointment with your optometrist. They will perform tests to determine whether ther...
Mar 1, 2006 · Other than visual acuity, visual function is actually comprised of many other components, including but not limited to: visual field, color perception, stereoacuity, glare recovery, dark adaptation, fixation and contrast sensitivity function (CSF).
Acuity versus Sensitivity. Introduction. This activity demonstrates two different ways that photoreceptors are connected to ganglion cells in the retina, and how these two systems trade off acuity for sensitivity. The rectangular black surface above represents a small patch of retina covered by rods (blue octagons) and cones (red octagons).
Relationship Between Acuity and Contrast Sensitivity. Visual acuity, because it is measured in terms of the smallest identifiable, high-contrast target, and because small sizes correspond to high spatial frequencies, measures visual sensitivity largely in the higher frequency regions of the contrast sensitivity function.
- 1985
Mar 21, 2017 · Visual acuity tests have proven to be useful for assessment of refractive error, screening for ocular health, following the course of eye disease, evaluating the effectiveness of medical and surgical treatment, prescribing aids for the visually impaired, and setting vision standards for employment and driving.
Contrast sensitivity measures two variables, size and contrast, while acuity measures only size. Contrast sensitivity is very similar to auditory testing, which determines a patient’s ability to detect the lowest level of loudness of various sound frequencies.
