Cataract
Table:
Cataract

Magnified view of a cataract seen on examination with a slit lamp
Specialty	Ophthalmology
Symptoms	Faded colors, blurry vision, halos around light, trouble with bright lights, trouble seeing at night[1]
Complications	Falling, depression, blindness[2][3]
Usual onset	Gradual[1]
Causes	Aging, trauma, radiation exposure, following eye surgery[1][4]
Risk factors	Diabetes, smoking tobacco, prolonged exposure to sunlight, alcohol[1]
Diagnostic method	Eye examination[1]
Prevention	Sunglasses, not smoking[1]
Treatment	Glasses, cataract surgery[1]
Frequency	60 million (2015)[5]

Based on the table, identify if the claim is entailed, neutral, or refuted. Give your final answer in JSON format {"answer": "YOUR ANSWER"}.

Claim: Cataracts occur suddenly.

answer: refuted