Abstract
Keratoconus is a non-inflammatory ocular pathology affecting the cornea's shape due to thinning and protrusion. This condition can be unilateral or bilateral with asymmetric presentation between both eyes. Refractive correction with spectacles is helpful in the initial stages; however, contact lenses play a significant role in the advance stages. Various options for contact lenses are available, and practitioners can use those depending upon the severity of the condition, shape of the cone, and other factors. Scleral lenses have gained popularity in recent years because they vault over the cornea and the limbus with no touch and land on the sclera. Caution is warranted on the amount of vault created between the scleral lens and the cornea; hence accurate measurement can be a valuable tool for practitioners’ confidence in prescribing these lenses. This case presentation summarizes the use of Anterior Segment Optical Coherence Tomography (AS-OCT) to accurately measure the vault and finalize the lens fitting.
References
Rabinowitz YS. Keratoconus. Surv Ophthalmol 1998;42:297–319.
Chang, Clark Y DeNaeyer GW. Speciality Contact Lenses: Treat Your Keratoconous Patints Right. Rev Cornea Contact Lenses 2017:14–7.
Nau CB, Harthan J, Shorter E, Barr J, Nau A, Chimato NT, Hodge DO, Schornack MM. Demographic characteristics and prescribing patterns of scleral lens fitters: The scope study. Eye Contact Lens 2018;44:S265–72.
Woods CA, Efron N, Morgan P. Are eye-care practitioners fitting scleral contact lenses? Clin Exp Optom 2020;103:449–53.
Baldwin B, Moyer S. AS-OCT and the Specialty Contact Lens. Rev Cornea Contact Lenses 2012:32–5.
Gokhale NS. Epidemiology of keratoconus. Indian J Ophthalmol 2013;61:382–3.
Mohd-Ali B, Abdu M, Yaw CY, Mohidin N. Clinical characteristics of keratoconus patients in Malaysia: A review from a cornea specialist centre. J Optom 2012;5:38–42.
Alqudah N, Jammal H, Khader Y, Al-dolat W, Alshamarti S, Shannak Z. Characteristics of Keratoconus Patients in Jordan: Hospital-Based Population. Clin Ophthalmol 2021;115:881–7.
Maeda N, Klyce SD, Smolek MK, Thompson HW. Automated keratoconus screening with corneal topography analysis. Investig Ophthalmol Vis Sci 1994;35:2749–57.
Espandar L, Meyer J. Keratoconus: overview and update on treatment. Middle East Afr J Ophthalmol 2010;17:15–20.
Belin MW, Kundu G, Shetty N, Gupta K, Mullick R, Thakur P. ABCD: A new classification for keratoconus. Indian J Ophthalmol 2020;68:2831–4.
Grisevic S, Gilevska F, Biscevic A, Ahmedbegovic-Pjona M, Bohac M, Pidro A. Keratoconus progression classification one year after performed crosslinking method based on ABCD Keeratoconus Grading System. Acta Inform Medica 2020;28:18–23.
Ucar M, Cakmak HB, Sen B. A statistical approach to classification of keratoconus. Int J Ophthalmol 2016;9:1355–7.
Rathi VM, Mandathara PS, Dumpati S. Contact lens in keratoconus. Indian J Ophthalmol 2013;61:410–5.
Worp E Van Der. A Guide to Scleral Lens Fitting [Monograph Online].; 2010.
Abou Samra WA, Badawi AE, Kishk H, Abd El Ghafar A, Elwan MM, Abouelkheir HY. Fitting tips and visual rehabilitation of irregular cornea with a new design of corneoscleral contact lens: Objective and subjective evaluation. J Ophthalmol 2018:8 pages.
Yeung D, Sorbara L. Scleral Lens Clearance Assessment with Biomicroscopy and Anterior Segment Optical Coherence Tomography. Optom Vis Sci 2018;95:13–20.
Conner A. Fit specialty contact lenses with OCT Prevision. Rev Optom 2019:54–6.
Mickles C. What OCT can offer your specialty lens fits. Rev Optom 2020:80–6.
Lee Y, Sung KR, Na JH, Sun JH. Dynamic changes in anterior segment (AS) parameters in eyes with primary angle closure (PAC) and PAC glaucoma and open-angle eyes assessed using as optical coherence tomography. Investig Ophthalmol Vis Sci 2012;53:693–7.
Hall RC, Mohamed FK, Htoon HM, Tan DT, Mehta JS. Laser in situ keratomileusis flap measurements: Comparison between observers and between spectral-domain and time-domain anterior segment optical coherence tomography. J Cataract Refract Surg 2011;37:544–51.
Moutsouris K, Dapena I, Ham L, Balachandran C, Oellerich S, Melles GRJ. Optical coherence tomography, scheimpflug imaging, and slit-lamp biomicroscopy in the early detection of graft detachment after descemet membrane endothelial keratoplasty. Cornea 2011;30:1369–75.
Ishibazawa A, Igarashi S, Hanada K, Nagaoka T. Fourier-Domain Optical Coherence Tomography Versus Ultrasonic Pachymetry and Rotating Scheimpflug Camera. Cornea 2011;30:615–9.
Maeda N. Optical coherence tomography for corneal diseases. Eye Contact Lens 2010;36:254–9.
Shan J, DeBoer C, Xu BY. Anterior segment optical coherence tomography: Applications for clinical care and scientific research. Asia-Pacific J Ophthalmol 2019;8:146–57.
Gemoules G. A novel method of fitting scleral lenses using high resolution optical coherence tomography. Eye Contact Lens 2008;34:80–3.
Kojima R, Caroline P, Walker M, Kinoshita B, Andre M, Lampa M. Benefits of OCT when fitting Specialty Lenses. Contact Lens Spectr 2014:46, 48–51, 63.
Luo ZK, Jacobs DS. Current and potential applications of anterior segment optical coherence tomography in contact lens fitting. Semin Ophthalmol 2012;27:133–7.
Chaglasian M, Fingeret M, Davey PG, Huang WC, Leung D, Ng E, Reisman CA. The development of a reference database with the Topcon 3D OCT-1 Maestro. Clin Ophthalmol 2018;12:849–57.
Tom LM, Jacobs DS. Advances in Anterior Segment OCT For the Design and Fit of Scleral Lenses. Int Ophthalmol Clin 2019;59:31–40.
Vincent SJ, Alonso-Caneiro D, Collins MJ. Optical coherence tomography and scleral contact lenses: clinical and research applications. Clin Exp Optom 2018;102:224–41.
Rathi VM, Mandathara PS, Dumpati S, Sangwan VS. Change in vault during scleral lens trials assessed with anterior segment optical coherence tomography. Contact Lens Anterior Eye 2017;40:157–61.
Kauffman MJ, Gilmartin CA, Bennett ES, Bassi CJ. A Comparison of the short-term settling of three scleral lens designs. Optom Vis Sci 2014;91:1462–6.
This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
Copyright (c) 2024 Asia Pacific Journal of Health Sciences and Research