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Understanding lens surfacing /
Understanding Lens Surfacing is an indispensable training and reference text for the successful laboratory, a must for those considering expanding their practice to include surfacing, and a basic building block for introductory course work on ophthalmic lenses.
| Clasificación: | Libro Electrónico |
|---|---|
| Autor principal: | |
| Formato: | Electrónico eBook |
| Idioma: | Inglés |
| Publicado: |
Boston :
Butterworth-Heinemann,
[1992]
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| Temas: | |
| Acceso en línea: | Texto completo |
Tabla de Contenidos:
- Front Cover; Understanding Lens Surfacing; Copyright Page; Dedication; Table of Contents; Foreword; Preface; Chapter 1. Review of Optics; Lens Power; Transposition of Prescriptions; Prism; How to Specify Prism Base Direction; Frame and Lens Measurement Reviewed; Questions and Problems; Chapter 2. The Lens Blank; Lens and Lens Blank Terminology and Standards; Selecting the Correct Base Curve; Selecting Single-Vision Lens Blank Size; Selecting Multifocal Lens Blank Size; Questions and Problems; References; Chapter 3. Layout for Single-Vision Lens Surfacing; Introduction.
- Traditional Blocking Practice: Off-Center BlockingOn-Center Blocking; Questions and Problems; Chapter 4. Layout and Marking of Flat-Top and Curved-Top Lenses; Layout and Marking of Flat- and Curved-Top Multifocal Lenses Using Off-Center Blocking; Layout and Marking of Flat- and Curved-Top Multifocal Lenses Using On-Center Blocking; A Simplified ""On-Center"" Bifocal Blocking Method-No Computer Required; Frame Center Blocking; Questions and Problems; Chapter 5. Layout and Marking of Round Segmentand Blended Bifocal Lenses; Layout and Marking of Round Segment Lenses.
- Procedures for Round Segment Layout That Maximize Blank SizeComputer-Assigned Blank Seg Inset and Drop; Blended Bifocals; Questions and Problems; Reference; Chapter 6. Layout and Marking of Franklin-Style Lenses; Introduction; Lens Construction; Five Methods of Grinding Franklin-Style Bifocal Lenses; Marking E/D and F/D Trifocals; Questions and Problems; Chapter 7. Tool Curves and Lens Thickness: Basic Concepts; Introduction; Lens Curve Terminology; Tool Curves for Crown Glass Lenses; Lens Thickness; Tool Curves for High- or Low-Index Lenses; Summary of Essential Formulas.
- Questions and ProblemsAppendix: Using Compensated Power for Thick Lenses; Reference; Chapter 8. Tool Curves and Lens Thickness: Additional Factors; Surfacing Charts; Determining Lens Parameters; Other Center Thickness Corrections; Tool Curve Compensation; Questions and Problems; Chapter 9. Blocking and Cribbing; Lens Blocking; Precoating or Taping Lenses for Surfacing; Lens Blocks; Blocking the Lenses; Blocking in Prism; Block Maintenance; Dual Center Blocker; Keeping Alloy Fresh; Cribbing of Lenses; Offsetting the Block; Questions and Problems; References; Chapter 10. Generating.
- IntroductionTypes of Generators; Toric Generators; Setting the Generator; Coolants Used in Generating; Generator Wheels; The Gerber Optical SG-8 Surface Generator; The National Optronics Vista I Dry Generator; Questions and Problems; References; Chapter 11. Lap Tools; Introduction; Tool Materials; Brass Lap Gauges; Lap Scoring; Metal Padding; How Tools Are Marked; Most Tools A r e Used w i t h a Pad; Calculating Tool Curves; Finished Versus Semifinished Tools; Cutting the Tool; Checking Lap Tools f o r Accuracy; Storing Lap Tools; Questions and Problems; References.