Which of the following symptoms is consistent with corneal edema?

The presence of halos around lights is a common symptom associated with corneal edema. Corneal edema occurs when there is an accumulation of fluid in the cornea, which can lead to a distortion of the corneal surface. This distortion affects how light is refracted as it passes through the cornea, resulting in visual disturbances such as halos or glare around light sources. This symptom can be particularly pronounced at night or in dim lighting conditions, where the contrast between the light and dark background is notable.

In contrast, increased sensitivity to light, redness of the eye, and a pressure sensation are not specifically indicative of corneal edema. Increased sensitivity to light, or photophobia, often relates to other conditions involving inflammation or irritation of the eye. Redness can accompany many ocular conditions and does not specifically point to corneal edema. A pressure sensation in the eye might suggest conditions like glaucoma rather than edema. Therefore, the symptom of halos around lights is a direct result of the effects of corneal edema on visual perception.