Opacity
Opacity is a property of objects that obstruct light. In the context of medicine, opacity is often used to describe the quality of certain structures in radiology and ophthalmology.
Medicine[edit | edit source]
In radiology, opacity is used to describe structures that appear white on a radiograph. This is because these structures absorb more X-rays than the surrounding tissues. Examples of opacities in radiology include bone, tumors, and pneumonia.
In ophthalmology, opacity is used to describe any substance that prevents the passage of light into the eye or the transmission of light within the eye. Examples of opacities in ophthalmology include cataracts, corneal ulcers, and vitreous hemorrhages.
Physics[edit | edit source]
In physics, opacity is a measure of the impenetrability of electromagnetic or other kinds of radiation by a material. This is often related to the refraction and absorption of the radiation by the material.
See also[edit | edit source]
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