---
title: NCLE 3.2 Introduction
description: 3-2 Introduction
---

[Michael R. Jensen - Solutions](https://michaelrjensen.online/en/optical-cert-dump)

# [NCLE 3.2 Introduction](https://michaelrjensen.online/en/optical-cert-dump/3-2-introduction)

 Written by [MRJ](https://michaelrjensen.online/en/optical-cert-dump/author/mrj) | Mar 9, 2025 11:09:16 AM

| 3-2 | ***Introduction*** |
| --- | --- |

**In part 3, Fitting & Verification, we'll be applying that which we've studied in the**

**previous two sections about lens materials and designs and optical principles toward the**

**actual fitting of rigid and soft contact lenses. How big should a contact lens be? When**

**should it be fit on K, or steeper or flatter than K? What about its thickness and peripheral curves? These questions will be addressed in this section.**

 

**Although PMMA lenses are rarely fit today, the principles one needs to apply in fitting**

**them are fundamental to all rigid lenses and will therefore be covered in this session.**

**We'll begin with a discussion of palpebral lenses as well as larger lenses with wide**

**peripheral curves. The general characteristics, advantages, and disadvantages of each**

**will be discussed. This will be followed by methods and procedures for selecting base**

**curve, diameter, optical zone width, peripheral curves, and thickness through the use of**

**diagnostic lenses, nomograms and charts. Examples and practice exercises are included.**

 

**Dynamic flourescein patterns are used to assist in the evaluator of the fit of rigid contact**

**lenses. How and why this is accomplished is covered in the second half of Part 3. We'll**

**illustrate flourescein patterns of a spherical base curve on a spherical cornea, and**

**spherical base curves on a toric cornea are presented. Astigmatism with the rule, against**

**the rule, and oblique will be discussed and observed. Soft lens evaluation is then covered**

**to include fitting goals and the characteristics of a good fitting soft lens.**

 

**Part 3 concludes with a presentation of rigid and soft lens verification techniques to**

**include the use of the measuring hand magnifier, diameter gauge, projector inspection**

**devices, slit lamp, radiuscope, thickness gauge, lensometer, and profile analyzer. We'll**

**see that soft lenses too can be verified through the use of a hand magnifier, plastic templates, a soft lens analyzer, and the use of a water cell.**

 

**This section will conclude with a thirty-four question practice test based on the material covered.**

[View full post](https://michaelrjensen.online/en/optical-cert-dump/3-2-introduction)

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