This module will introduce you to ophthalmic lens theory. You will gain a knowledge and understanding of basic optics, spherical, astigmatic and toric lenses, the lens measure, lens thickness and the effect of incorporating an ophthalmic prism in a spectacle lens. You will also learn how the field of view is altered when looking through a spectacle lens.

At the end of this module, you should be able to:

  • Describe the materials and recall the terminology used in ophthalmic lenses

  • Demonstrate a knowledge and understanding of basic optical principles which apply to ophthalmic lenses, the lens measure and its relation to lens thickness

  • Recognise and define terms relating to ophthalmic prisms

  • Apply basic mathematical concepts to solve ophthalmic lens problems both graphically and by calculation

  • Carry out all types of transposition

Teaching Method

You will attend a 2.5 hour class weekly for 13 weeks in Semester 2.A range of teaching and learning methods will be used throughout the module. These will include lectures, practical work, question and answer sessions.


  • The module will be examined at the end of semester 2 in a 1.5 hour closed book examination which will consist of structured questions.

To pass this module you will need a mark of 40%