Purpose:To
present the profile of keratoconic contact lens wearers, alongside with performance of corneal and scleral rigid gas permeable
(RGP) at different stages of keratoconus based on limited diagnostic resources. Methods:5-year
Clinical records of keratoconic corneal and scleral RGP contact lens wearers were retrieved. Data on age, gender, visual
acuity (VA), refraction (RE), stage of keratoconus and mode of correction among
other variables were obtained for analysis. Information pertaining to
the outcome in pre and post-fit at different severity was determined. Results: A total of 124 medical records
were analyzed, with the age (20.86 ± 9.50 years), gender (58.9% male and 41.1%
female), Laterality (57.3% bilateral, 26.6% right eye and left eye as 16.1%)
and ethnicity (91.1% Africans and 8.9%Asians).
There were no significant differences in effects of lenses (RGP and Scleral
lenses) across three stages in visual acuity and in three stages of severity HRGP (2) = 1.05, p = 0.59;HScleral(1) = 2.24,
References
[1]
Downie, L.E. and Lindsay, R.G. (2015) Contact Lens Management of Keratoconus. Clinical and Experimental Optometry, 98, 299-311. https://doi.org/10.1111/cxo.12300
[2]
Hassani, M., Jafarzadehpur, E., Mirzajani, A., Yekta, A. and Khabazkhoob, M. (2018) A Comparison of the Visual Acuity Outcome between Clearkone and RGP Lenses. Journal of Current Ophthalmology, 30, 85-86. https://doi.org/10.1016/j.joco.2017.08.006
[3]
Mohammadpour, M., Heidari, Z. and Hashemi, H. (2018) Updates on Managements for Keratoconus. Journal of Current Ophthalmology, 30, 110-124. https://doi.org/10.1016/j.joco.2017.11.002
[4]
Gokhale, N.S. (2013) Epidemiology of Keratoconus. Indian Journal of Ophthalmology, 61, 382-383. https://doi.org/10.4103/0301-4738.116054
[5]
Amanzadeh, K., Karimian, F. and Khanlari, M. (2012) Management of Keratoconus. Journal of Ophthalmic & Vision Research, 7, 341-346.
[6]
Mahadevan, R., Arumugam, A.O., Arunachalam, V. and Kumaresan, B. (2009) Keratoconus—A Review from a Tertiary Eye-Care Center. Journal of Optometry, 2, 166-172. https://doi.org/10.3921/joptom.2009.166
[7]
Wu, Y., Tan, Q., Zhang, W., Wang, J., Yang, B., Ma, W., et al. (2015) Rigid Gas-Permeable Contact Lens Related Life Quality in Keratoconic Patients with Different Grades of Severity. Clinical and Experimental Optometry, 98, 150-154. https://doi.org/10.1111/cxo.12237
[8]
de Luis Eguileor, B., Etxebarria Ecenarro, J., Santamaria Carro, A. and Feijoo Lera, R. (2018) Irregular Corneas: Improve Visual Function With Scleral Contact Lenses. Eye Contact Lens, 44, 159-163. https://doi.org/10.1097/ICL.0000000000000340
[9]
Koppen, C., Kreps, E.O., Anthonissen, L., Van Hoey, M., Dhubhghaill, S.N. and Vermeulen, L. (2018) Scleral Lenses Reduce the Need for Corneal Transplants in Severe Keratoconus. American Journal of Ophthalmology, 185, 43-47. https://doi.org/10.1016/j.ajo.2017.10.022
[10]
Masiwa, L.E. and Moodley, V. (2020) A Review of Corneal Imaging Methods for the Early Diagnosis of Pre-Clinical Keratoconus. Journal of Optometry. https://doi.org/10.1016/j.optom.2019.11.001
[11]
Al-Mahrouqi, H.H., Al-Shamli, N., Mohan, N.R., Oraba, S.B., Panchatcharam, S.M., Al-Saidi, R., et al. (2018) Clinical Profile of Omani Keratoconus Patients: An Experience from a Tertiary Referral Centre in Muscat. Oman Journal of Ophthalmology, 11, 259-264. https://doi.org/10.4103/ojo.OJO_203_2017
[12]
Rashid, Z.A., Millodot, M. and Evans, K.S.E. (2016) Characteristics of Keratoconic Patients Attending a Specialist Contact Lens Clinic in Kenya. Middle East African Journal of Ophthalmology, 23, 283-287. https://doi.org/10.4103/0974-9233.194074
[13]
Nelson-Ayifah, D., et al. (2017) Profile of Keratoconus in Selected Eye Clinics, Accra: A Retrospective Study. Ophthalmology and Vision Science, 1, 8-16.
[14]
Munsamy, A.J., Moodley, V.R., Naidoo, P., Mangwarara, T.R., Abdullah, R., Govender, D., et al. (2015) A Frequency Analysis of Cone Characteristics for the Different Stages of Keratoconus. African Vision and Eye Health, 74, a302. https://doi.org/10.4102/aveh.v74i1.302
[15]
Chetty, E. and Rubin, A. (2019) Preliminary Demographics for Patients with Keratoconus Attending a University-Based Clinic in Johannesburg, South Africa. African Vision and Eye Health, 78, a472. https://doi.org/10.4102/aveh.v78i1.472
[16]
Zadnik, K., Barr, J.T., Edrington, T.B., Everett, D.F., Jameson, M., McMahon, T.T., et al. (1998) Baseline Findings in the Collaborative Longitudinal Evaluation of Keratoconus (CLEK) Study. Investigative Ophthalmology & Visual Science, 39, 2537-2546.
[17]
Cumberland, P.M., Chianca, A. and Rahi, J.S. (2016) Accuracy and Utility of Self-Report of Refractive Error. JAMA Ophthalmology, 134, 794-801. https://doi.org/10.1001/jamaophthalmol.2016.1275
[18]
Ezinne, N.E., Austin, E., Ilechie, A.A. and Mashige, K.P. (2019) Contact Lens Prescribing Patterns in Abuja, Nigeria. Journal of the Nigerian Optometric Association, 21, 26-32.
[19]
Kenya National Bureau of Statistics (KNBS) (2013) Exploring Inequality. Nairobi.
[20]
Chaudhary, M. and Kandel, H. (2017) Visual Outcome in Keratoconus with Spherical Rigid Gas Permeable Contact Lens. Journal of the Institute of Medicine, 39, 8-11.
[21]
Abdu, M., Mohd Ali, B. and Binnawi, K. (2015) Corrected Visual Functions in Keratoconus Patients with Rigid Gas-Permeable Contact Lens and Its Association with Cone Location. Sudanese Journal of Ophthalmology, 7, 48-52. https://doi.org/10.4103/1858-540X.169436
[22]
Shi, Y. (2016) Strategies for Improving the Early Diagnosis of Keratoconus. Clinical Optometry, 8, 13-21. https://doi.org/10.2147/OPTO.S63486
[23]
Althomali, T.A. (2018) Relative Proportion of Different Types of Refractive Errors in Subjects Seeking Laser Vision Correction. The Open Ophthalmology Journal, 12, 53-62. https://doi.org/10.2174/1874364101812010053
[24]
Balcer, L.J., Miller, D.H., Reingold, S.C. and Cohen, J.A. (2015) Vision and Vision-Related Outcome Measures in Multiple Sclerosis. Brain, 138, 11-27. https://doi.org/10.1093/brain/awu335
[25]
Roy, S., Yadav, S., Dasgupta, T., Chawla, S., Tandon, R. and Ghosh, S. (2019) Interplay between Hereditary and Environmental Factors to Establish an in Vitro Disease Model of Keratoconus. Drug Discovery Today, 24, 403-416. https://doi.org/10.1016/j.drudis.2018.10.017
[26]
Bhamra, T.S. and Tighe, B.J. (2017) Mechanical Properties of Contact Lenses: The Contribution of Measurement Techniques and Clinical Feedback to 50 Years of Materials Development. Contact Lens Anterior Eye, 40, 70-81. https://doi.org/10.1016/j.clae.2016.11.005
