Certified Ophthalmic Assistant Practice Exam

Halos around lights can occur due to the presence of corneal deposits, which can affect the cornea's transparency and refractive properties. When corneal deposits are present, they can scatter light as it passes through the cornea, leading to the perception of halos or starburst patterns around light sources. This effect is especially noticeable at night or in low-light conditions when the pupils dilate and allow more light to enter the eye.

The other conditions listed do not typically lead to the experience of halos. Vitreous hemorrhage may cause floaters or a sudden decrease in vision, but not halos. Retinal detachment can lead to symptoms like flashes of light or shadow in the visual field but is less likely to cause the specific phenomenon of halos. Allergic conjunctivitis usually presents with symptoms like itching, tearing, and redness, which are not directly associated with halos around lights. Thus, corneal deposits are the most relevant condition related to this visual symptom.