Spectacle Assembly Course

Lesson 1 • Lens Types and Optical Basics

Introduces lens materials, shapes, and basic optical properties relevant to assembly. Connects lens characteristics to handling and fitting decisions.

Lesson 2 • The Assembly Workflow Overview

Maps the end-to-end production sequence from receiving components to final inspection. Provides context for each skill taught in later chapters.

Lesson 3 • Anatomy of an Eyeglass Frame

Covers every structural part of a frame, from front to temples. Establishes shared vocabulary used throughout the entire course.

Lesson 1 • Organising the Assembly Workstation

Applies 5S principles to arrange tools and materials for efficient, error-free assembly. An organised station reduces cycle time and misplacement errors.

Lesson 2 • Hand Tools for Frame Assembly

Identifies and demonstrates proper use of pliers, screwdrivers, and alignment tools. Correct tool selection prevents frame and lens damage.

Lesson 3 • Bench Machines and Equipment

Covers ultrasonic cleaners, heat guns, and lens edgers used at the assembly bench. Proper machine operation ensures consistent output quality.

Lesson 1 • Hinge Tension Adjustment and Testing

Demonstrates methods to adjust and verify hinge tension after assembly. Correct tension ensures temples open and close smoothly without drooping.

Lesson 2 • Hinge Types and Installation

Covers barrel hinges, spring hinges, and flex hinges and their installation methods. Correct installation ensures smooth temple movement and long-term durability.

Lesson 3 • Screw Types and Specifications

Identifies frame screws by head type, thread pitch, and material. Matching the correct screw to each application prevents stripping and loosening.

Lesson 1 • Installing Screw-In Nose Pads

Covers the step-by-step process of attaching screw-in pads without stripping the pad box. Correct installation prevents pad loss during wear.

Lesson 2 • Nose Pad Types and Materials

Surveys silicone, acetate, and push-in nose pad styles and their applications. Material choice affects comfort, grip, and compatibility with frame design.

Lesson 3 • Nose Pad Arm Mechanics

Explains pad arm geometry and how arm angle affects lens height and pantoscopic tilt. Understanding arm mechanics guides precise adjustment decisions.

Lesson 1 • Full-Rim Lens Insertion

Covers heating, stretching, and snapping lenses into plastic and metal full-rim frames. Correct technique prevents lens stress fractures and frame distortion.

Lesson 2 • Semi-Rimless Mounting Techniques

Teaches threading nylon cord and mounting lenses in grooved semi-rimless frames. Proper cord tension keeps lenses secure without cracking the groove.

Lesson 3 • Rimless Lens Drilling and Mounting

Covers drill-mount techniques for attaching hardware directly to rimless lenses. Precise drilling prevents lens cracking and ensures hardware alignment.

Lesson 1 • Adjusting Metal Frames

Covers bending techniques for metal temples, bridges, and pad arms using appropriate pliers. Metal frames require controlled force to avoid kinking or cracking.

Lesson 2 • Frame Geometry and Measurement

Introduces pantoscopic tilt, face-form angle, and vertex distance as key alignment parameters. Measuring these values is the foundation of all adjustment work.

Lesson 3 • Adjusting Plastic and Acetate Frames

Teaches heat-softening methods for bending plastic frames without surface damage. Controlled heat application is essential to prevent warping or discoloration.

Lesson 4 • Temple Length and Ear Bend Fitting

Covers measuring and adjusting temple length and the ear bend for secure, comfortable retention. Correct ear bend placement prevents slipping and pressure points.

Lesson 1 • Visual Inspection Techniques

Teaches systematic visual scanning of frames under proper lighting for surface and assembly defects. Structured scanning prevents missed defects during inspection.

Lesson 2 • Inspection Standards and Criteria

Defines accept/reject thresholds for cosmetic and functional defects based on industry norms. Clear criteria ensure consistent decisions across all inspectors.

Lesson 3 • Defect Documentation and Disposition

Establishes procedures for tagging, recording, and routing defective frames for rework or scrap. Accurate documentation supports root-cause analysis and process improvement.

Lesson 1 • Error-Proofing Assembly Steps

Applies poka-yoke concepts to prevent common assembly mistakes before they become defects. Error-proofing reduces rework and inspection burden.

Lesson 2 • Continuous Improvement Participation

Teaches assemblers to identify improvement opportunities and contribute to kaizen events. Active participation builds a culture of ongoing quality and efficiency gains.

Lesson 3 • Production Metrics and Reporting

Covers reading and contributing to daily production boards, yield reports, and defect tallies. Data literacy enables assemblers to monitor their own performance.

Lesson 4 • Lean Principles in Eyeglasses Assembly

Introduces value stream mapping and the seven wastes as applied to an assembly bench. Recognizing waste is the first step toward measurable efficiency gains.