Janice K. Ledford Books

The little eye book

By Janice K. Ledford

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Certified ophthalmic assistant exam review manual

By Janice K.. Ledford

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"The Certified Ophthalmic Assistant Exam Review Manual, Third Edition is a revised edition of the best-selling exam preparation manual. It is an essential resource for anyone preparing to become ce...

Principles and Practice in Ophthalmic Assisting

By Al Lens, Janice K. Ledford

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Certified Ophthalmic Technician Exam Review Manual

By Janice K. Ledford

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Certified Ophthalmic Technician Exam Review Manual

By Janice K. Ledford

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Certified ophthalmic technician exam review manual

By Janice K. Ledford

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The slit lamp primer

By Janice K. Ledford

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Handbook of Clinical Ophthalmology for Eyecare Professionals

By Janice K. Ledford

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Handbook of Clinical Ophthalmology for Eyecare Professionals

By Janice K. Ledford

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How to Convert ISBN-10 to ISBN-13 (and Vice Versa): A Complete Guide

If you’re in the world of books—whether as a publisher, librarian, bookseller, or avid collector—you’ve likely come across the terms ISBN-10 and ISBN-13. Understanding these formats and knowing how to convert between them is essential for maintaining consistency and compatibility in book records. In this post, we’ll cover everything you need to know about ISBN conversions, step by step.

What is an EAN and How Does it Relate to an ISBN?

If you’ve ever purchased a product online or in a store, you’ve likely come across a barcode. Behind these barcodes lies a standardized system that makes modern commerce possible. Two key codes often encountered are the EAN (European Article Number) and ISBN (International Standard Book Number). But what are they, how are they connected, and why are they so crucial? Let’s explore.