Standard

Posted: 03/17/08

R State Standard £ Institutionally Developed College: N/A

OPD 107 Optical Laboratory Techniques II

Course Description

This course continues students' study of lens fabrication. Emphasis is placed on using specialized lens materials and multifocal surfacing and finishing techniques. Topics include: specialized lens fabrication; multifocal lenses; inspection of multifocal lenses; optical calculations; frame repairs; and final inspection and optical equipment maintenance.

Competency Areas	Hours
Specialized Lens Fabrication	Class	4
Multifocal Lenses	D. Lab	2
Inspection of Multifocal Lenses	P. Lab/O.B.I.	9
Optical Calculations	Credit	8
Frame Repairs
Final Inspection and Optical Equipment Maintenance

Prerequisite:	OPD 106
Corequisite:

Course Guide

Competency	After completing this section, the student will be able to:	Hours
		Class	D.Lab	P.Lab/ O.B.I.
SPECIALIZED LENS FABRICATION		5	1	6
Multifocal	Name the various types and styles of segs available in multifocal lenses.
Laminated lenses	Discuss the special techniques used to fabricate various types of laminated lenses (polarized and corlon).
Photochromic	Discuss the special techniques used to fabricate photochromic lenses.
High-index lenses	Discuss the advantages and disadvantages of high-index glass lenses when compared to other lens materials.
Plastic lenses	Discuss the advantages and disadvantages of high-index plastic lenses when compared to other lens materials.
Polycarbonate lenses	Discuss the special care required in working polycarbonate lenses.
Progressive lenses	Discuss the special techniques used to fabricate progressive lenses.
MULTIFOCAL LENSES		10	2	10
Multifocal	Use the centration process to establish reference points for the seg, major reference point, and the 180 degree line.
Seg height	Calculate the seg height of a multifocal lens.
Seg inset	Calculate the seg inset of a multifocal lens.
Total inset	Calculate the total inset of a multifocal lens.
Positioning flat tops	Mark a multifocal flat top lens to indicate major reference point and seg center.
Positioning curve tops	Mark a multifocal curve top lens to indicate major reference point and seg center.
Positioning round segs	Mark a multifocal round seg lens to indicate major reference point and seg center.
Positioning executive style lens	Mark a multifocal executive lens to indicate major reference point and seg center.
Positioning blended lens	Mark a multifocal blended lens to indicate major reference point and seg center.
Positioning progressive-addition lens	Mark a progressive-addition lens (PAL) to indicate major reference point and seg center.
INSPECTION OF MULTIFOCAL LENSES		5	1	10
Surface quality	Demonstrate the procedure used to verify quality of the front and back surfaces of a multifocal lens.
Internal characteristics	Demonstrate the procedure used to verify the quality of the internal characteristics of a multifocal lens.
Waviness	Demonstrate the procedure for detecting waviness in lenses.
Power verification	Use a lensmeter to verify the power of each section of a multifocal lens.
OPTICAL CALCULATIONS		5	1	14
PD	Define interpupillary distance.
	Explain the change in interpupillary distance when comparing PD distant to PD near.
	Contrast PD binocular with PD monocular.
C, center datum	Define the C dimension as it applies to lens fabrication.
Caliper, vernier	Use a vernier caliper to measure width of lens.
Center	Define optical center as it applies to a lens.
	Contrast the geometrical center of a lens with the mechanical center of a lens.
Fitting cross	Describe the purpose and dimensional range of the fitting cross when applied to a lens.
DBC, DBL	Explain the method(s) used to determine DBC and DBL.
Effective diameter	Explain the procedure used to determine the effective diameter of a lens.
D, lens diopter	Define diopter as applied to lens calculation.
Prism diopter	Define the term prism diopter as applied to lens calculations.
Seg drop	Define vertical decentration or seg drop as applied to lens fabrication.
Eye size	Contrast the eye size dimension as used in the boxing and datum systems.
Seg height	Define seg height as applied to optical lens calculations.
Seg inset	Explain the method used to determine seg inset.
Total inset	Define total inset as applied to positioning of the seg.
Datum line	Mark the datum line on a lens.
Mounting line	Define mounting line as it applies to a lens and metal frames.
MBS	Define MBS as it applies to lens fabrication.
OD/OS/OU	Explain the difference in OD, OS, and OU notation when applied to optical calculations.
Plano	Define the term plano as it applies to optical calculations.
HIGH-INDEX LENSES		5	1	10
Refractive indexes	State the refractive indexes of common high-index lenses.
Fabrication techniques	Contrast edging method used on high-index lenses with those used on crown glass lenses.
Temperature shock	Discuss methods of avoiding temperature shock when working high-index lenses.
Notching and drilling	Explain why notching and drilling is avoided in working high-index lenses.
FRAME REPAIRS		5	7	20
Major/minor repairs	Contrast major and minor frame repairs.
Hinges	Describe common failures of frame hinges.
	Remove and replace a hinge on a metal frame.
	Remove and replace a hinge on a zyl frame.
Loose hinge screws	Describe the methods used to tighten hinges which have threaded hinge pins.
	Describe techniques used to loosen stubborn hinge screws.
	Remove broken or stuck hinge screws from a frame.
	Use a tap to restore barrel threads of a frame hinge.
Cable temples	Describe the method of shortening cable temples.
	Shorten a cable temple for an eyewear frame.
Plastic frames	Contrast the advantages of different types of glues used to repair plastic frames.
Nose pads	Describe the procedure used to replace plastic nose pads.
	Replace plastic nose pads on an eyewear frame.
	Describe the use of metal studs to attach nose pads to frames.
	Describe the types and sizes of nose pads used on frames.
	Replace nose pads on a frame with a metal stud system.
	Loose lens
	Describe the loose lens condition.
	Correct a loose lens condition.
	Describe the loose lens condition in which a portion of the lens bevel is visible.
	Correct a condition where the lens bevel is partly out of the frame rim.
	Correct a loose lens condition using the tape or lens washer method.
Buffing	Describe the techniques used to buff frames.
	Restore the finish to a metal frame using the buffing method.
	Restore the finish to a plastic frame using the buffing method.
Soldering	Describe the soldering methods used to repair frames. Repair a frame using solder.
Discoloration	Discuss methods available to restore discolored frames to their original color.
FINAL INSPECTION AND OPTICAL EQUIPMENT MAINTENANCE		5	7	20
Master schedule	Discuss the contents of a master schedule for maintaining optical equipment.
Lensmeter	Calibrate the power of a lensmeter.
	Check the prism of a lensmeter.
	Check the accuracy of the lensmeter marker system.
	Check the accuracy of the centration devices.
Edgers	Calibrate an edger.
	Service an edger in accordance with the manufacturer's service instructions.
Surface machine	Service a lens surface machine in accordance with the manufacturer's service instructions.
Finishing machine	Service a lens finishing machine in accordance with the manufacturer's service instructions.

Suggested Resources

Brooks, C. F. (1983). Essentials for Ophthalmic Lens Work. Stoneham, MA: Butterworth-Heinemann.

Brooks, C. F., & Borish, I. (1986). System for Ophthalmic Dispensing. Stoneham, MA: Butterworth-Heinemann.