ABO Ophthalmology Complete Practice Exam 2025

Titanium is recognized as the most hypoallergenic frame material among the options provided. This is primarily due to its unique properties that make it highly biocompatible, meaning it is unlikely to cause allergic reactions or skin irritations. Titanium is often used in medical implants and other applications where compatibility with body tissues is crucial, reinforcing its reputation for being hypoallergenic.

Additionally, titanium does not contain nickel, which is a common allergen found in many metal alloys used in eyewear, such as stainless steel. The absence of nickel significantly reduces the risk of allergy, making titanium frames a safe choice for individuals with sensitivities.

Other materials like plastic can sometimes contain additives or colorants that may cause allergic reactions in sensitive individuals. Aluminum also may lead to allergies due to its potential for skin irritation, while stainless steel, despite being durable and lightweight, frequently contains nickel and other alloys that could provoke allergic responses. Thus, titanium stands out as the optimal choice for those looking for hypoallergenic eyewear.