Certified Paraoptometric (CPO) Practice Exam

The term that describes the cornea changing to an irregular cone shape is keratoconus. This condition involves a progressive thinning of the cornea, leading to a distortion that causes the cornea to bulge outward in a conical shape. As the cornea becomes more irregular, it can result in significant visual impairment and may require special corrective lenses or surgical intervention to manage the vision changes.

In contrast, the other terms mentioned refer to different ocular conditions. A chalazion is a localized swelling and blockage of the oil glands in the eyelid, while diabetic retinopathy is a complication of diabetes affecting the retina, leading to vision changes. A hordeolum, commonly known as a stye, is an infection of the glands in the eyelid, causing localized swelling and discomfort. Understanding these different terms helps clarify the unique characteristics and issues associated with each condition, reinforcing why keratoconus specifically relates to the irregular shaping of the cornea.