Course image REFRACTIVE ERROR AND LOW VISION
Instructional Technology
REFRACTIVE ERROR AND LOW VISION

UNIT 1: REFRACTIVE ERROR AND REFRACTION

LEARNING OBJECTIVES

  • To understand refractive error, demonstrate refraction technique and prescribe refractive prescription.

LEARNING OUTCOMES

At the end of the module the student should be able to

Knowlegde:

  • Identify refractive errors: Hyperopia, Myopia, Astigmatism and Presbyopia
  • Describe accommodation and its relation to age
  • Describe the differences between cycloplegic and manifest refraction
  • Explain the difference between subjective and objective refraction
  • Measure refractive error with an autorefractor
  • Perform and record retinoscopy
  • Refine refractive error(sphere & cylinder) using phoropter and trial lenses
  • Use refractometry techniques: Fogging, duochrome, binocular balancing
  • Perform and record transposition and optical cross
  • Calculate and record spherical equivalent
  • Determine near add