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What are the classifications of corneal scars?

Jan 24, 2025 Source: Cainiu Health
Dr. Wang Shuai
Introduction
In general, corneal scars can be classified into three categories: nebula, macula, and leukoma. Nebula appears as a fog-like opacity, relatively thin, through which the iris texture behind the opacity can still be clearly seen. Its formation may be due to superficial corneal inflammation; during the resolution phase of the inflammation, corneal tissue repairs itself and mild fibrous tissue proliferation occurs, resulting in this type of faint scar.

Generally, corneal scars can be categorized into three types: nebular opacity (cloudy opacity), macular opacity, and leukoma. Detailed analysis is as follows:

1. Nebular Opacity

Nebular opacity appears as a fog-like, relatively thin opacity, through which the iris texture behind can still be clearly seen. Its formation may be due to superficial corneal inflammation. During the resolution phase of the inflammation, corneal tissue repairs itself and mild fibrous tissue proliferation occurs, resulting in this type of faint scar. This kind of scar has a relatively minor impact on vision, and visual acuity usually does not decrease significantly. For example, some mild corneal inflammations may leave nebular opacity after recovery.

2. Macular Opacity

Macular opacity is thicker than nebular opacity, appears gray-white and semi-transparent. This type of scar is generally caused by deeper corneal inflammation or trauma that involves the middle layer of the cornea. During the healing process, relatively more fibrous tissue proliferation occurs, forming this type of scar. For example, deep corneal ulcers may result in macular opacity after healing. Its impact on vision is greater than nebular opacity, and the iris can only be vaguely seen through the opaque area.

3. Leukoma

Leukoma appears porcelain-white and completely opaque; the iris cannot be seen at all through the opaque area. Leukoma typically forms due to severe corneal lesions, such as serious corneal injuries causing damage through the full thickness of the cornea, or deep corneal ulcers. When the corneal tissue suffers extensive and deep damage, significant fibrous tissue proliferation occurs during the healing process, leading to the porcelain-white leukoma. Leukoma severely affects vision, often causing significant visual impairment or even blindness. If the leukoma is located in the central optical zone of the cornea, the visual damage will be even more pronounced.

Corneal scars help doctors formulate appropriate treatment plans based on the specific condition of the scar. If there is any eye discomfort or suspected symptoms of corneal scarring, prompt medical attention should be sought for diagnosis and treatment by a qualified physician.

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