Skip to main content
SpringerLink
Log in
Book cover

Corneal Topography pp 103–121Cite as

Contact Lens Practice

  • Chapter
  • First Online:

Abstract

Topography is useful for the fitting of contact lenses, particularly in irregular corneas and for rigid lenses. By identifying the curvature of the steepest and flattest areas of the cornea and generating a simulated fluorescein pattern, it can direct the selection of the initial back surface curvature to be tried, thereby reducing the number of trial lenses required. It can also inform the design of custom design lenses.

Corneal irregularity can cause visual loss which is correctable by rigid contact lenses, but not by glasses. Topography is valuable in identifying such cases. In severe cases, such information can be sent to contact lens manufacturers to inform custom lens designs.

Monitoring post-fitting can detect contact lens-induced corneal warpage, due to sustained pressure from the lens in areas of touch. Various patterns can occur, including changes of astigmatism, irregular astigmatism, oblate pattern (flattening centrally and steepening towards the periphery) and a steep-flat pattern with flattening under an eccentric lens with corresponding steepening elsewhere. If the steepening is inferior, this may mimic keratoconus. Warpage tends to reverse after several weeks without lens wear, but if lenses have been worn for many years, the corneal shape may never return to normal. Warpage should have reversed as fully as possible prior to taking measurements for biometry or refractive surgery.

This is a preview of subscription content, log in via an institution.

Chapter
USD   29.95
Price excludes VAT (USA)
  • Available as PDF
  • Read on any device
  • Instant download
  • Own it forever
eBook
USD   99.00
Price excludes VAT (USA)
  • Available as EPUB and PDF
  • Read on any device
  • Instant download
  • Own it forever
Hardcover Book
USD   129.99
Price excludes VAT (USA)
  • Durable hardcover edition
  • Dispatched in 3 to 5 business days
  • Free shipping worldwide - see info

Tax calculation will be finalised at checkout

Purchases are for personal use only

Learn about institutional subscriptions

References

*References Particularly Worth Reading

  1. ACLM Industry Statistics – contact lens market. Today; March 28th 1994; 23.

    Google Scholar 

  2. Dart JKG. Predisposing factors in microbial keratitis: the significance of contact lens wear. Br J Ophthalmol. 1988;72:926–30.

    Article  CAS  Google Scholar 

  3. Dart JKG, Stapleton F, Minassian D. Contact lenses and other risk factors in microbial keratitis. Lancet. 1991;338:650–3.

    Article  CAS  Google Scholar 

  4. Schein OD, Glynn RJ, Poggio EC, Seddon JM, Kenyon KR. The relative risk of ulcerative keratitis among users of daily-wear and extended-wear soft contact lenses: a case-control study. Microbial Keratitis Study Group. N Engl J Med. 1989;321(12):773–8.

    Article  CAS  Google Scholar 

  5. Poggio EC, Glynn RJ, Schein OD, Seddon JM, Shannon MJ, Scardino VA, Kenyon KR. The incidence of ulcerative keratitis among users of daily-wear and extended-wear soft contact lenses. N Engl J Med. 1989;321:779–83.

    Article  CAS  Google Scholar 

  6. Stern GA. Contact lens associated bacterial keratitis: past, present, and future. CLAO J. 1998;24(1):52–6.

    CAS  PubMed  Google Scholar 

  7. Keay L, Stapleton F, Schein O. Epidemiology of contact lens-related inflammation and microbial keratitis: a 20-year perspective. Eye Contact Lens. 2007;33:346–53.

    Article  Google Scholar 

  8. Stone J, Phillips AJ. Contact lenses. London: Butterworths; 1989.

    Google Scholar 

  9. Douthwaite WA. Contact lens optics. London: Butterworths; 1987.

    Google Scholar 

  10. *Stevenson RWW, Corbett MC, O’Brart DPS, Rosen ES. Corneal topography in contact lens fitting. Eur J Implant Ref Surg. 1995;7(5):305–317.

    Article  Google Scholar 

  11. Fredrick S, Wilson G. The relation between eyelid tension, corneal toricity, and age. Invest Ophthalmol Vis Sci. 1983;24:1367–73.

    Google Scholar 

  12. Schnider CM, Kennedy L, Mintle L, Carr C, Hnatko T. Comparison of computerised corneal topography device nomogram and topographical fits to trial lens fitting. Invest Ophthalmol Vis Sci. 1995;36(Suppl):1458.

    Google Scholar 

  13. Szcotka LB, Capretta DM, Lass JH. Effect of computerised titration on videokeratoscope contact lens fitting. Invest Ophthalmol Vis Sci. 1995;36(Suppl):1458.

    Google Scholar 

  14. *Szczota LB, Capretta DM, Lass JH. Clinical evaluation of a computerised topography software method for fitting rigid gas permeable contact lenses. CLAO J. 1995;20:231–235.

    Google Scholar 

  15. Szczotka LB. Evaluation of a topographically based contact lens fitting software. Optom Vis Sci. 1997;74:14–9.

    Article  CAS  Google Scholar 

  16. *Astin CLK, Gartry DS, Steele ADMcG. Contact lens fitting after photorefractive keratectomy. Br J Ophthalmol. 1996;80:597–603.

    Article  CAS  Google Scholar 

  17. McCarey B, Zurawski C, O’Shea D. Practical aspects of a corneal topography system. CLAO J. 1992;18:248–54.

    CAS  PubMed  Google Scholar 

  18. Wang X, McCulley JP, Bowman RW, et al. Time to resolution of contact lens-induced corneal warpage prior to refractive surgery. CLAO J. 2002;28(4):169–71.

    CAS  PubMed  Google Scholar 

  19. Ruiz-Montenegro J, Mafra CH, Wilson SE, Jumper JM, Klyce SD, Mendelson EN. Corneal topographic alterations in normal contact lens wearers. Ophthalmology. 1993;100:128–34.

    Article  CAS  Google Scholar 

  20. *Wilson SE, Lin DTC, Klyce SD, Reidy JJ, Insler MS. Topographic changes in contact lens-induced warpage. Ophthalmology. 1990;97:734–744.

    Article  CAS  Google Scholar 

  21. *Wilson SE, Klyce SD. Screening for corneal topographic abnormalities before refractive surgery. Ophthalmology. 1994;101:147–152.

    Article  CAS  Google Scholar 

  22. Corbett MC, O’Brart DPS, Marshall J. Biological and environmental risk factors for regression after photorefractive keratectomy. Ophthalmology. 1996;103:1381–91.

    Article  CAS  Google Scholar 

  23. Phillips AJ. Orthokeratology – an alternative to excimer laser. J BCLA. 1995;18:65–71.

    Google Scholar 

  24. Hsiao CH, Lin HC, Chen YF, Ma DHK, Yeh LK, Tan HY, Huang SCM, Lin KK. Infectious keratitis related to overnight orthokeratology. Cornea. 2005;24:783–8.

    Article  Google Scholar 

  25. Tseng CH, Fong CF, Chen WL, Hou YC, Wang IJ, Hu FR. Overnight orthokeratology-associated microbial keratitis. Cornea. 2005;24(7):778–82.

    Article  Google Scholar 

  26. Yepes N, Lee SB, Hill V, Ashenhurst M, Saunders PP, Slomovic AR. Infectious keratitis after overnight orthokeratology in Canada. Cornea. 2005;24(7):857–60.

    Article  Google Scholar 

  27. Nesburn AB, Bahri S, Salz J, Rabinowitz YS, Maguen E, Hofbauer J, Belin M, Macy JI. Keratoconus detected by videokeratography in candidates for photorefractive keratectomy. J Refract Surg. 1995;11:194–201.

    CAS  PubMed  Google Scholar 

  28. Stevenson RWW. Analysis of post-PRK topography maps. Invest Ophthalmol Vis Sci. 1995;36(Suppl):1792.

    Google Scholar 

Download references

Author information

Authors and Affiliations

  1. Imperial College Healthcare NHS Trust, London, UK

    Melanie Corbett

  2. University Hospital Coventry and Warwickshire, Coventry, UK

    Nicholas Maycock

  3. Manchester, UK

    Emanuel Rosen

  4. Department of Ophthalmology, St. Thomas Hospital, London, UK

    David O’Brart

Authors
  1. Melanie Corbett
    View author publications

    You can also search for this author in PubMed Google Scholar

  2. Nicholas Maycock
    View author publications

    You can also search for this author in PubMed Google Scholar

  3. Emanuel Rosen
    View author publications

    You can also search for this author in PubMed Google Scholar

  4. David O’Brart
    View author publications

    You can also search for this author in PubMed Google Scholar

Rights and permissions

Reprints and permissions

Copyright information

© 2019 Springer Nature Switzerland AG

About this chapter

Check for updates. Verify currency and authenticity via CrossMark

Cite this chapter

Corbett, M., Maycock, N., Rosen, E., O’Brart, D. (2019). Contact Lens Practice. In: Corneal Topography. Springer, Cham. https://doi.org/10.1007/978-3-030-10696-6_7

Download citation

  • DOI: https://doi.org/10.1007/978-3-030-10696-6_7

  • Published:

  • Publisher Name: Springer, Cham

  • Print ISBN: 978-3-030-10694-2

  • Online ISBN: 978-3-030-10696-6

  • eBook Packages: MedicineMedicine (R0)

Publish with us

Policies and ethics

Search

Navigation