Is eye opacity the same as cataract?
Nov 17, 2025
Source: Cainiu Health
Dr. Wang Shuai
Introduction
Pterygium, commonly referred to as "eye film," typically occurs at the limbus—the junction between the conjunctiva on the eye's surface and the cornea. It appears as a triangular fleshy tissue growing from the white part of the eye toward the pupil. In early stages, it may only slightly affect appearance, but as it progresses, it can extend over the cornea, leading to decreased vision. Pterygium is often associated with prolonged exposure to ultraviolet light and irritation from wind and dust.
Generally speaking, eye pterygium is not cataract; they are two distinct eye conditions with clear differences in affected areas and clinical manifestations. If there are any concerns, it is recommended to seek medical consultation promptly. Detailed analysis is as follows:
Pterygium usually refers to a wing-shaped growth on the conjunctiva at the edge of the cornea on the eye surface. It appears as a triangular fleshy tissue growing from the white part of the eye toward the pupil area. In early stages, it may only slightly affect appearance, but as it progresses, it can encroach upon the cornea and lead to vision loss. It is commonly associated with prolonged exposure to ultraviolet light and irritation from wind and dust.
Cataracts, on the other hand, occur inside the eye's lens. The lens, normally transparent, gradually becomes cloudy due to the disease, obstructing light from entering the eye. The main symptom is progressive vision decline, blurred vision, possibly accompanied by reduced contrast sensitivity and changes in color perception. Cataracts are primarily related to aging, genetics, diabetes, and other factors. Unlike pterygium, cataracts do not cause visible tissue overgrowth on the eye surface.
If abnormal tissue growth or blurred vision is noticed in the eye, prompt visit to an ophthalmologist is advised. Professional examination can accurately identify the condition and prevent treatment delays caused by misdiagnosis. Additionally, proper eye protection in daily life is important to minimize external irritants and protect eye health.
