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You're asking about the maximum diameter of invisible glasses or contact lenses.

Invisible glasses, also known as clear glasses or frameless glasses, typically have a smaller diameter than traditional glasses with frames. The maximum diameter of invisible glasses depends on various factors, including the type of lens material, the desired prescription power, and the intended use (daily wear, sports, etc.).

Here are some general guidelines for the maximum diameter of invisible glasses:

• Contact lenses: The maximum diameter of contact lenses is typically around 14-15 mm (0.55-0.59 inches). This is because larger lenses can cause discomfort, dryness, and other issues.
• Invisible glasses with a single vision prescription: The maximum diameter for single-vision invisible glasses is usually around 50-52 mm (1.97-2.05 inches).
• Progressive addition lenses (PALs): For PALs, the maximum diameter is typically larger, ranging from 55-60 mm (2.17-2.36 inches) or more, depending on the specific prescription and design.

Keep in mind that these are general guidelines, and the actual maximum diameter of invisible glasses may vary depending on the manufacturer, model, and specific requirements.

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