What Is Contrast Sensitivity?

In daily life, the human eye needs to distinguish objects with clear boundaries and objects with blurred boundaries. The latter resolution is called contrast sensitivity (CS).

Contrast sensitivity

Right!

In daily life, the human eye needs to distinguish objects with clear boundaries and objects with blurred boundaries. The latter resolution is called contrast sensitivity (CS).

Chinese name

Contrast sensitivity

Foreign name

Contrast sensitivity

Nature

Sensitivity

Attributes

Compared

Defined as visual

The inverse of the contrast threshold that the system can detect

Contrast sensitivity (CS) is defined as the inverse of the contrast threshold that the visual system can perceive. Contrast sensitivity = 1 / contrast threshold. If the contrast threshold is low, the contrast sensitivity is high, and the visual function is good. At a certain spatial frequency, the visual system has a certain contrast sensitivity; conversely, at the same contrast, the visual system has a certain spatial frequency resolution (shape perception).

Clinically, the visual system

1. Determination of visual contrast sensitivity:

IVA-CS test has important practical value for early detection of glaucoma, macular disease, diabetic retinopathy, and optic nerve disease. It is one of the important examinations to evaluate the effect of excimer laser surgery.

2. Determination of glare contrast sensitivity:

It mainly measures the degree of damage to the adaptive function of retinal photoreceptor cells caused by macular degeneration, and can analyze the cause of the decline in the ability of the human eye lens to absorb light due to disability glare. Since excimer laser surgery may have an effect on the glare contrast of the patient, the doctor should aim at the glare contrast measurement of the patient with the molecular laser surgery.

3. Retinal vision measurement:

It can predict the visual acuity after cataract, vitreous and corneal transplantation, judge the prognosis of the operation, and provide a basis for the surgeon to formulate a diagnosis and treatment plan.

4. Determination of color vision acuity:

Check the color discrimination of the MC and YMC decimal numbers of human eyes and the color vision ability of the RBG spatial frequency response. It can quantitatively and qualitatively determine the value of the color blindness function of color blindness, and provide a new topic for the clinical diagnosis of acquired color vision disorders. Correction and corrective effect.