OPT207 - Eyeglass Dispensing Theory II

Subject Title
Eyeglass Dispensing Theory II

Subject Description
This subject provides the students with the theoretical foundations for dispensing specialized prescriptions for presbyopic correction. Lens designs, frame selection and specific measurements and fitting techniques are considered within the framework of practical dispensing applications while emphasizing the professional responsibility of the optician on patient education on wear and care for multifocal and progressive eyewear.

Credit Status
One credit toward the Opticianry Diploma Program

Learning Outcomes
Upon successful completion of this subject the student will be able to:

Upon successful completion of this subject, the student will be able to:
 

1. Collect subjective and objective information related to patient vision and visual needs to select appropriate eyewear.     

• Record subjective information in patient file.
• 1.2 Record objective information in patient file.

   
          2. Compare and contrast the construction, design and indications for use of various segmented bifocal and trifocal lenses.  

•   Define multifocal lenses and discuss the need of use for multifocal eyeglasses.
•   Present the bifocal experience of hyperopes and myopes in terms of need, accommodation and high add power.
•   Discuss frame selection for bifocal and trifocal eyeglasses.
•   Identify various bifocal lens designs indicating materials and parameters. 
•   Identify image jump in vary bifocal lens designs.  
•   Identify trifocal lens designs indicating materials and parameters.
•   Discuss the steps involved in measuring the power of bifocal and trifocal lenses with the manual and automated lensometer.
•   Present techniques for fitting bifocal lenses.
•   Present techniques for fitting trifocal lenses.
•   Discuss protocols for measuring pupillary distances for bifocal and trifocal lenses
•   Contrast the procedures for fitting bifocal and trifocal lenses in terms of measuring  heights, comparison with old lenses and     patient's preferences. 

          3. Analyze the prismatic effect of multifocal and progressive lenses and determine corrective measures.              

• Discuss the vertical imbalance induced in a pair of eyeglasses, calculate error and  determine the method of correction.
• Calculate the vertical imbalance in a pair of bifocal eyeglasses using the slab-off an dissimilar segments methods.
• Discuss the use of thickness reduction prism (TRP) in the manufacture of multifocal lenses.
• Identify the effect of prism thinning on progressive lenses.          
•  Present the theory of Fresnel lenses and prisms and applications for their use.     

 
          4. Differentiate progressive addition lenses in terms of design, fitting procedures, adaptive response and patient education.

•  Define progressive addition lenses and discuss the need of use for progressive eyeglasses. 
•  Discuss frame selection for progressive addition eyeglasses.
•   Present the history of development and manufacturing of progressive lenses.        
•   Identify currently available progressive lenses.
•   Select appropriate lenses based on Rx and patient needs. 
•   Measure monocular inter-pupillary distance and the major reference point height using precise measuring devices.
•   Present the procedures for verifying progressive lenses. 
•   Present the procedures for dispensing progressive lenses, troubleshooting  and instructions for the patient and    troubleshooting.     
• Present the elements of effective continuity of care for the multifocal and progressive  lens wearer
• Identify and remake/duplicate lenses.    
•  

          5.     Demonstrate the implications on vision of a lens positioned at a different distance than refracted.   

•   Define vertex distance.
•   Discuss vertex distance considerations.
•   Calculate the effective power of spherical and sphero-cylindrical lenses.
•   Calculate the compensated power of spherical and sphero-cylindrical lens.

        
          6. Determine the lens power and the effect on vision when eyeglass position of wear changes

• Define lens tilt and lens wrap-around.
• Calculate lens power changes due to pantoscopic tilt.
• Calculate lens power changes due to wrap- around
• Discuss the effect on vision of power induced by lens tilt and wrap-around.

         
         7. Based on case studies, discuss the principles of dispensing multifocal and progressive eyeglasses, considering prescribed lens
             power and patient's needs.  

•   Identify suitable lenses and frames for a patient based on a given prescription,anatomical measurements and patient needs.
• Advise a patient on the expectations and limitations of vision and eyeglass wear

  

                                                                                                                                                               

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