Galen Medical Surgical Exam 2 Practice

Light scattering from a cloudy, opaque lens is the key feature here. When the lens becomes glassy or Opacified as in cataracts, incoming light is spread in multiple directions instead of passing cleanly through. That scattering creates glare and halo-like rings around bright lights, which is a classic symptom patients notice—especially at night when lights are bright against a dark backdrop. As cataracts progress, overall vision also dulls and contrast sensitivity drops, making daily tasks harder.

Other eye problems don’t fit this pattern. Glaucoma centers on optic nerve damage and typically shows up as gradual peripheral vision loss rather than halos from lights. Macular degeneration mainly blurs or distorts central vision. Retinal detachment presents with sudden changes like flashes, floaters, or a curtain over part of the field of vision.