1. What is Lens Thickness Calculation?

The lens thickness calculation using sagitta is a fundamental optical formula that determines the center thickness of a lens based on its diameter, radius of curvature, and sagittal depth.

2. How Does the Calculator Work?

The calculator uses the sagitta formula:

Where:

• \( D \) — Lens diameter (mm)
• \( R \) — Radius of curvature (mm)
• \( S \) — Sagittal depth (mm)

Explanation: The formula calculates the theoretical center thickness of a lens based on its optical parameters.

3. Importance of Thickness Calculation

Details: Accurate thickness calculation is crucial for lens manufacturing, optical design, and ensuring proper fit in frames.

4. Using the Calculator

Tips: Enter diameter, radius, and sagitta in millimeters. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is sagitta in optical terms?
A: Sagitta is the height or depth of a curved surface, measured from the chord to the arc.

Q2: How does diameter affect lens thickness?
A: Larger diameters generally result in thicker lenses, as thickness increases with the square of the diameter.

Q3: What's the relationship between radius and thickness?
A: Smaller radii (steeper curves) result in thicker lenses, as the curvature is more pronounced.

Q4: Are there limitations to this calculation?
A: This is a theoretical calculation and actual thickness may vary based on material properties and manufacturing processes.

Q5: Can this be used for both convex and concave lenses?
A: Yes, the formula works for both types, though interpretation of results may differ based on lens design.