Applications of different types of gas-permeable contact lenses in keratoconus and their visual results


Purpose: To show applications of different types of gas-permeable contact lenses in patients with keratoconus and to compare visual acuity (VA) results.

Methods: A total of 229 eyes of 133 patients who used different types of rigid gas-permeable contact lenses between April 2003 and April 2010 at the Cornea and Contact Lens Unit of Eye Clinic 2 of the Ministry of Health, Ulucanlar Eye Training and Research Hospital, were included. Visual acuity of patients was classified as uncorrected and corrected with eyeglasses and corrected with contact lenses. The patients were compared in terms of VA, daily contact lens wear time, and complications.

Results: A total of 70 out of 133 (52.6%) patients in our study were male, and 63 (47.4%) were female. The mean age was 25.9 ± 7.03 years (12-45). As for the classification of the 229 eyes included in the study, 136 of 229 (59.4%) eyes had moderate keratoconus, 88 (38.4%) had advanced keratoconus, and 5 (2.2%) had severe keratoconus. Following the contact lens application, the VA in all patients increased when compared to uncorrected and corrected with eyeglasses groups and the difference was statistically significant (p<0.005). When a comparison of different types of contact lenses was made, a statistically significant difference was not found (p>0.5) in terms of increase in VA. When patients were evaluated in terms of contact lens wear times, it was observed that Boston Equalens II was preferred by patients wearing lenses 4-8 hours/day. For patients wearing lenses more than 8 hours a day, Rose K lens was used the most. No serious complication was observed in any of the patients that would lead them to stop wearing contact lenses during the follow-up period. There was also no need for keratoplasty in any patient during the follow-up period.

Conclusions: We detected an increase in VA in patients with rigid contact lenses. In addition, some contact lenses were better tolerated by patients and were used for a longer time during the day.

Eur J Ophthalmol 2014; 24(6): 835 - 841


Article Subject: Cornea



Burcu Kazanci, Dilay Ozek, Alparslan Anayol, Ays¸e Balikçi, Dilek Ileri, Pelin Yilmazbas¸

Article History


Financial Support: No financial support was received for this submission.
Conflict of Interest Statement: None of the authors has conflict of interest with this submission.

This article is available as full text PDF.

  • If you are a Subscriber, please log in now.

  • Article price: Eur 36,00
  • You will be granted access to the article for 72 hours and you will be able to download any format (PDF or ePUB). The article will be available in your login area under "My PayPerView". You will need to register a new account (unless you already own an account with this journal), and you will be guided through our online shop. Online purchases are paid by Credit Card through PayPal.
  • If you are not a Subscriber you may:
  • Subscribe to this journal
  • Unlimited access to all our archives, 24 hour a day, every day of the week.



  • Department of Ophthalmology, S.B. Ankara Sincan Lokman Hekim Hospital, Ankara - Turkey
  • Department of Ophthalmology, S.B. Ankara Numune Education and Research Hospital, Ankara - Turkey
  • Department of Ophthalmology, S.B. Ulucanlar Eye Education and Research Hospital, Ankara - Turkey
  • Department of Ophthalmology, S.B. S¸evket Yılmaz Education and Research Hospital, Bursa - Turkey

Article usage statistics

The blue line displays unique views in the time frame indicated.
The yellow line displays unique downloads.
Views and downloads are counted only once per session.

No supplementary material is available for this article.