Advertisement

The Refractive State of the Human Eye

  • Karina Conlin
  • Stephen L. TrokelEmail author
Chapter

Abstract

A large portion of the sensory input to the brain arises from the visual system. Visual function is related to the optical properties of the eye dependeny upon its axial length, the corneal curvature, and the crystalline lens. The optical clarity of the cornea and lens are essential to maintain clear vision. Focusing errors can be corrected by prosthetic devices namely spectacles (in use for over a thousand years) and Contact lenses (In use for over 80 years). Recent surgical innovations allow accurate adjustment of corneal optical power and have become an acceptable alternative. There are however complications and safety issues with all technologies that are used to improve vision.

Keywords

Refractive state of the human eye Myopia Hyperopia Correction of refractive errors Multifocal spectacles Giant papillary conjunctivitis Contact lenses 

Suggested Reading

  1. Contact Lens Spectrum: monthly newsletter subscription related to clinical contact lens information on overcoming complications and new technologies. https://www.clspectrum.com/.
  2. Duane A. Normal values of the accommodation at all ages. JAMA. 1912;59:1010–3.CrossRefGoogle Scholar
  3. Farhad H, Randleman JB, editors. Corneal cross-linking. 2nd ed. Thorofare: Slack Incorporated; 2017.Google Scholar
  4. Goldschmidt E, Jacobsen N. Genetic and environmental effects on myopia development and progression. Eye (Lond). 2014;28(2):126–33.CrossRefGoogle Scholar
  5. GPLI (Gas Permeable Lens Institute) website (webinars): https://www.gpli.info/.
  6. Tylers Quarterly: soft contact lens parameter guide. Subscription to quarterly magazine with up to date lens availability. http://www.tylersq.com/.
  7. Young TL, Metlapally R, Shay AE. Complex trait genetics of refractive error. Arch Ophthalmol. 2007;125(1):38–48.CrossRefGoogle Scholar
  8. Walker M. Introduction to scleral lenses; GP lens institute, webinar, 2017. Gpli.info. Accessed 10 May 2017.
  9. van der Worp EA. Guide to scleral lens fitting [monograph online]. Forest Grove, OR: Pacific University; 2010. Available from: http://commons.pacificu.edu/mono/4/.

Copyright information

© Springer Nature Switzerland AG 2019

Authors and Affiliations

  1. 1.Department of Ophthalmology and Visual SciencesUniversity of Wisconsin School of Medicine and Public HealthMadisonUSA
  2. 2.Columbia University Irving Medical CenterNew YorkUSA
  3. 3.Department of OphthalmologyEdward S. Harkness Eye Institute, Columbia University Vagelos College of Physicians and SurgeonsNew YorkUSA

Personalised recommendations