Which characteristic describes the material as chemically stable and physiologically inert?

Which characteristic describes the material as chemically stable and physiologically inert?

• A. Chemically stable and physiologically inert
• B. Safe
• C. Provides adequate oxygen
• D. Optically clear

Answer: (A)

A material that is chemically stable and physiologically inert is one that resists chemical changes in tear fluid and does not provoke biological reactions in the eye. This combination is essential for biocompatibility, ensuring the lens remains safe over time and won’t release irritants or cause inflammation. The phrase directly describes a lens material that stays stable under physiological conditions and remains non-reactive with ocular tissues, which is why it’s the best match. Other options point to important properties—overall safety, oxygen transmission, or optical clarity—but they describe separate performance aspects rather than the specific stability and inertness of the material.

A material that is chemically stable and physiologically inert is one that resists chemical changes in tear fluid and does not provoke biological reactions in the eye. This combination is essential for biocompatibility, ensuring the lens remains safe over time and won’t release irritants or cause inflammation. The phrase directly describes a lens material that stays stable under physiological conditions and remains non-reactive with ocular tissues, which is why it’s the best match. Other options point to important properties—overall safety, oxygen transmission, or optical clarity—but they describe separate performance aspects rather than the specific stability and inertness of the material.