What is indicated by a gray or white ring around the iris?

The presence of a gray or white ring around the iris is indicative of Arcus Senilis, which is a condition characterized by the deposition of lipid deposits in the corneal margin. This ring often appears in older adults as part of the aging process, but it can also signify hyperlipidemia in younger individuals. It is considered a normal variation in older populations and generally does not affect vision or indicate any serious health problems.

In contrast, pterygium refers to a growth of tissue on the conjunctiva, typically related to UV exposure and leading to irritation or discomfort, rather than an appearance around the iris. Corneal Arcus is another term sometimes used interchangeably with Arcus Senilis but is less commonly seen in clinical jargon to describe the same condition. Conjunctival injection refers to redness of the conjunctiva due to inflammation or irritation and is not associated with the formation of a ring around the iris. Understanding these distinctions helps to recognize the correct identification and implication of the symptoms presented.