How to Read Ocr 420 and Other Frame Numbers

By Lensabl | Published: 2026-10-31

Category: How-to Guides

Learn to decode eyeglass frame numbers like the Ocr 420. This guide explains what each part means and how to use them for replacement or ordering.

Quick Answer

To read frame numbers like Ocr 420, identify the model, size, and color code printed on the temple or bridge. Use these numbers to find compatible replacement lenses or reorder the same frame.

Why Frame Numbers Matter

Frame numbers are your key to getting the right replacement lenses or a duplicate frame. They tell you the model, size, and color options, so you can avoid ordering the wrong part.

For example, a frame like the Costa Ocr 420 has a clear model number that helps you find matching lenses. The size and color codes ensure you get a frame that fits and looks the way you want.

Common Mistakes When Reading Frame Numbers

One common mistake is confusing the model number with the size. The model number identifies the frame style, while the size is usually a separate measurement printed on the temple.

Another mistake is ignoring the color code. Two frames with the same model can have different colors, and the code ensures you get the exact color you want.

Step-by-Step Guide to Reading Frame Numbers

Locate the frame numbers: Look on the inside of the temple arm or on the bridge. Most frames have a series of numbers and letters printed there. Check both temples—sometimes numbers are only on one side.
Identify the model number: The model number is usually the first part, like 'Ocr 420'. It tells you the frame style and is essential for finding compatible lenses. Write down the model number exactly as shown—missing a digit can lead to ordering the wrong frame.
Read the size measurements: Look for numbers like 54-18-140, which represent lens width, bridge width, and temple length in millimeters. These ensure the frame fits your face. Compare these measurements to your current frame to ensure the new one will fit similarly.
Check the color and lens codes: The color code (e.g., 'MBLCK' for Matte Black) tells you the frame color, and the lens code (e.g., 'Clear') specifies the lens type. Use these when ordering replacement lenses or a new frame. If you're ordering lenses, confirm the lens color matches your prescription needs—clear lenses are standard, but tints may affect vision.
Use the numbers when ordering: When buying replacement lenses or a new frame, provide the full set of numbers to the retailer or use them to search online. This avoids mistakes and ensures compatibility. Keep a photo of the frame numbers on your phone for easy reference when shopping.

Example: Costa Ocr 420 Frame Numbers

Ocr 420: The Costa Ocr 420 is available in a Matte Black frame with Clear lenses, and the listing includes options for Frame Color and Lens Color. This shows how frame numbers and color codes work together to specify a complete frame configuration.
Ocr 420