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A visual phenomenon where a bright ring or circle of light appears to encircle a point light source (like a car headlight or street lamp). It is caused by the diffraction and scattering of light entering the eye.
read more about halos around lights ...Often a symptom of corneal edema (swelling), corneal abrasions, or early-stage cataracts, where opacities or swelling cause light to scatter aberrantly.
Sudden onset of colored halos, especially with blurred vision and pain, can be a symptom of acute angle-closure glaucoma, requiring immediate attention.
Halos are a common, usually temporary, side effect following refractive surgeries like LASIK, due to changes in the corneal surface profile or residual nighttime aberrations.
If the light is diffracted by a periodic structure (like tiny water droplets in the cornea), the different wavelengths (colors) are separated, creating a rainbow effect.
No. Glare is overall reduced contrast and excessive brightness. Halos are specific, distinct rings of light surrounding the source.
If halos are new, worsening, or accompanied by pain and vision loss, immediate consultation is needed to rule out glaucoma or rapidly progressing cataract.