scholarly journals DEJAVNIKI TVEGANJA ZA ZAPLETE PRI UPORABI KONTAKTNIH LEČ

2016 ◽  
Vol 85 (2) ◽  
Author(s):  
Mirna Štabuc Šilih
Keyword(s):  
Visual Acuity ◽  
Medical History ◽  
Contact Lens ◽  
Contact Lenses ◽  
Living Environment ◽  
Inappropriate Use ◽  
Everyday Work ◽  
And Storage

Contact lenses are freely available without professional examination and fitting, as well as without adequate introduction and instructions on handling, disinfection and storage. Contact lenses may have physiological, metabolic and anatomic effect on the eyes, which is manifested both on the eyelids, lacrimal film, conjunctiva and in all layers of the cornea - the epithelium, stroma and the endothelium. We can see these complications too often at our everyday work. The purpose of this paper is to draw attention to the potential complications due to inappropriate use of contact lenses.Contact lenses are otherwise a safe and effective method of correcting visual acuity; they are also useful for therapeutic purposes. Complications related to contact lenses wear could be largely avoided with an appropriate professional approach and the compliance of contact lens wearers. It is important to discuss with patients their medical history, their desires and expectations, their working and living environment; followed by professional examination of patients and appropriate fitting of contact lenses. Patients should receive detailed oral and written instructions and be subscribed to regular checks. But unfortunately, all this is not enough, if patients do not comply every day with given instructions.

Underestimated risks for bacterial keratitis in contact lens usage

2021 ◽  
Vol 26 (3) ◽  
pp. 2626-2630
Author(s):  
EVELINA MILCHEVA MARINOVA ◽  
◽  
DIMITAR STOIMENOV DABOV ◽  
YANI TODOROV ZDRAVKOV ◽  
EMILIA KRASIMIROVA NASEVA ◽  
...  
Keyword(s):  
Risk Factors ◽  
Contact Lens ◽  
Contact Lenses ◽  
Negative Impact ◽  
Bacterial Keratitis ◽  
Ophthalmic Examination ◽  
The Social ◽  
And Storage ◽  
Predisposing Conditions

Objective: The purpose of our research is to emphasize the role of underestimated predisposing conditions for microbial keratitis in contact lens users, to draw attention to the complications of wearing contact lenses without ophthalmic examination, and to offer a short questionnaire for fast and easy estimation of the risk factors for bacterial keratitis. Methods: A series of 23 cases of healthy young individuals, treated for bacterial keratitis, provoked а research on the predisposing factors for its development. Results: 55% of the patients had started to wear contact lenses without specific examination. 75% had made mistakes in the hygiene and storage of the lenses. We identified risk factors for development of bacterial keratitis in all cases. Conclusions: A thorough anamnesis and ophthalmic examination are crucial in decision making about contact lens wearing because they could reveal some of the predisposing conditions for the occurrence of ocular complications. The usage of contact lenses without a prescription poses health risks and could have a negative impact on the social and healthcare system.

scholarly journals Preliminary Clinical Exploration of Scleral Lens Performance on Normal Eyes

2018 ◽  
Vol 2 (2) ◽  
pp. e14-e21
Author(s):  
Melissa Barnett ◽  
Jonathon Ross ◽  
Blythe Durbin-Johnson
Keyword(s):  
Visual Acuity ◽  
Contact Lens ◽  
Healthy Subjects ◽  
Contact Lenses ◽  
Front Surface ◽  
Contact Lens Wear ◽  
Factors Associated ◽  
Rigid Contact ◽  
Lens Wear ◽  
Spectacle Correction

Abstract Objectives: The purpose of this study was to evaluate the performance (i.e. vision, comfort and fit) of spherical and front-surface toric scleral lenses in subjects with regular, healthy corneas. Methods: Scleral lenses were fitin the eyes (n = 16) of healthy subjects (n = 9) with regular corneas, absent of pathology, and studied using an observational, multi-visit design. Lens fit was objectively evaluatedby an experienced practitioner.Following 1 month of successful lens wear, participants completedsubjective satisfaction surveys regarding the scleral lens wearing experience. Results:  According to participant surveys, scleral lenses were subjectively preferred over soft toric or gas permeable contact lenses in 88% of eyes, including in all eyes fit with a front-surface toric scleral lens (n = 3). Seventy-five percent (75%) of eyes achieved visual acuity of 0.1 logMAR or better, while all eyes with prior spectacle wear achieved visual acuity with a scleral lens within 1 Snellen line of spectacle correction. Seventy-five percent (75%) of eyes achieved good subjective comfort with a scleral lens. No participants reported poor subjective vision and/or comfort. Conclusions:  Our findings suggest that subjects preferred the performance of a scleral lens (spherical or front-surface toric) compared to a soft toric or gas permeable contact lens. Moreover, scleral lenses may provide a viable, alternative contact lens modality option for patients considering discontinuation of traditional soft toric and/or rigid contact lens wear; so long as the factors associated with hypoxia remain minimized. Key Words:  scleral lens; scleral contact lens; front-surface toric scleral lens; lens performance; normal eyes; healthy eyes

scholarly journals Clinical Performance of Toris K Contact Lens in Patients with Moderate to Advanced Keratoconus: A Real Life Retrospective Analysis

2016 ◽  
Vol 2016 ◽  
pp. 1-6 ◽  
Author(s):  
Ihsan Yilmaz ◽  
Ferah Ozcelik ◽  
Berna Basarir ◽  
Gokhan Demir ◽  
Gonul Durusoy ◽  
...  
Keyword(s):  
Visual Acuity ◽  
Contact Lens ◽  
Contact Lenses ◽  
Clinical Performance ◽  
Real Life ◽  
Soft Contact Lenses ◽  
Corrected Visual Acuity ◽  
Uncorrected Visual Acuity ◽  
Central Cone ◽  
The Mean

Objectives.To evaluate the visual performance of Toris K soft contact lenses in patients with moderate-to-advanced keratoconus and also to compare the results according to cone types, cone location, and severity of keratoconus.Materials and Methods.Sixty eyes of 40 participants were included in this retrospective study. Uncorrected visual acuity (UCVA), best-spectacle corrected visual acuity (BCVA), best-contact lens corrected visual acuity (BCLCVA), and comfort rating via visual analogue scales (VAS) were measured.Results.The mean age was 27.3 ± 8.6 years (range: 18 to 54). The mean logMAR UCVA, BCVA, and BCLCVA were 0.85 ± 0.38 (range: 0.30–1.30), 0.47 ± 0.27 (range: 0.10–1.30), and 0.16 ± 0.20 (range: 0–1.00). There were significant increases in visual acuities with contact lenses (p<.05). BCLCVA was significantly better in oval type than globus type (p=.022). UCVA and BCLCVA were significantly better in moderate keratoconus group (p=.015,p=.018). The mean line gain in Snellen was 3.6 ± 1.8 lines (range: 0–7 lines). The mean line gain was higher in central cone group than paracentral cone group and oval group than globus group (p=.014,p=.045). The mean VAS score was 8.14 ± 1.88 (range: 6–10).Conclusions.Toris K can improve visual acuity of patients with keratoconus. Toris K is successful even in the moderate and advanced form of the disease.

scholarly journals Reverse Geometry Hybrid Contact Lens Fitting in a Case of Donor-Host Misalignment after Keratoplasty

2013 ◽  
Vol 2 (2) ◽  
pp. 69-72
Author(s):  
Rafael J Pérez-Cambrodí ◽  
Pedro Ruiz-Fortes
Keyword(s):  
Visual Acuity ◽  
Contact Lens ◽  
Contact Lenses ◽  
Anterior Segment ◽  
Successful Outcome ◽  
Imaging Evaluation ◽  
Visual Rehabilitation ◽  
Distance Visual Acuity ◽  
Fitting In ◽  
Contact Lens Fitting

ABSTRACT Purpose To report the successful outcome obtained after fitting a new hybrid contact lens in a cornea with an area of donor-host misalignment and significant levels of irregular astigmatism after penetrating keratoplasty (PKP). Materials and methods A 41-year-old female with bilateral asymmetric keratoconus underwent PKP in her left eye due to the advanced status of the disease. One year after surgery, the patient referred a poor visual acuity and quality in this eye. The fitting of different types of rigid gas permeable contact lenses was performed, but with an unsuccessful outcome due to contact lens stability problems and uncomfortable wear. Scheimpflug imaging evaluation revealed that a donor-host misalignment was present at the nasal area. Contact lens fitting with a reverse geometry hybrid contact lens (Clearkone, SynergEyes Carlsbad) was then fitted. Visual, refractive, and ocular aberrometric outcomes were evaluated during a 1-year period after the fitting. Results Uncorrected distance visual acuity improved from a prefitting value of 20/200 to a best corrected postfitting value of 20/20. Prefitting manifest refraction was +5.00 sphere and .5.50 cylinder at 75°, with a corrected distance visual acuity of 20/30. Higher order root mean square (RMS) for a 5 mm pupil changed from a prefitting value of 6.83 μm to a postfitting value of 1.57 μm (5 mm pupil). The contact lens wearing was referred as comfortable, with no anterior segment alterations. Conclusion The SynergEyes Clearkone contact lens seems to be another potentially useful option for the visual rehabilitation after PKP, especially in cases of donor-host misalignment. How to cite this article Pérez-Cambrodí RJ, Ruiz-Fortes P, Llorens DPP. Reverse Geometry Hybrid Contact Lens Fitting in a Case of Donor-Host Misalignment after Keratoplasty. Int J Kerat Ect Cor Dis 2013;2(2):69-72.

scholarly journals A case report of visual outcome in keratoconus with retinitis pigmentosa

2018 ◽  
Author(s):  
Chiun-Ho Hou ◽  
Yun-Wen Chen ◽  
Ken-Kuo Lin ◽  
Jiahn-Shing Lee ◽  
Lai-Chu See ◽  
...  
Keyword(s):  
Visual Acuity ◽  
Visual Field ◽  
Retinitis Pigmentosa ◽  
Contact Lens ◽  
Contact Lenses ◽  
Life Quality ◽  
Visual Outcome ◽  
Visual Aids ◽  
Blurred Vision ◽  
Visual Rehabilitation

Abstract Background: It is uncommon to see retinitis pigmentosa in keratoconus patients. The main difficulty of visual rehabilitation for this is restricted visual field. We presented the treatment and gene screen of visual system homeobox 1 (VSX 1) gene in this case. Case presentation: A 24-year-old man with retinitis pigmentosa presented with progressively blurred vision. Slit lamp examination revealed Vogt’s striae over both eyes, and corneal topography indicated bilateral keratoconus. We had tested 5 exons of VSX 1 gene from him and the did not find mutation on direct sequence. To improve visual acuity, we prescribed keratoconus rigid gas permeable (RGP) contact lens for him with good efficacy. However, lens dislocation occurred occasionally. He could not find dislocated lens easily due to visual field restriction, so he asked for more stable visual aids. Therefore, we instead prescribed scleral lens (SL), which were more stable on the ocular surface and led to more stable vision. Visual acuity was also gained with SL, but the tolerance time for SL was shorter compared to that of keratoconus RGP contact lens. To compare the efficacy of these two lenses, we surveyed life quality using the National Eye Institute Visual Functioning Questionnaire – 25 in three situations: baseline, with keratoconus RGP contact lens, and with SL. Conclusion: The patient used the two lens types according to his needs, and benefited from vision rehabilitation with both keratoconus RGP contact lens and SL. Keywords: keratoconus; retinitis pigmentosa; rigid gas permeable contact lenses; scleral lenses.

scholarly journals Comparison of the efficacy of lotrafilcon B and comfilcon A silicone hydrogel bandage contact lenses after transepithelial photorefractive keratectomy

2021 ◽  
Vol 10 (2) ◽  
pp. 43-49
Author(s):  
Nancy M. Lotfy ◽  
Tariq Alasbali ◽  
Abdulrahman M. Alsharif ◽  
Saeed M Al- Gehedan ◽  
Sabah Jastaneiah ◽  
...  
Keyword(s):  
Visual Acuity ◽  
Pain Score ◽  
Contact Lens ◽  
Contact Lenses ◽  
Corneal Thickness ◽  
Photorefractive Keratectomy ◽  
Epithelial Defect ◽  
Silicone Hydrogel ◽  
Corneal Epithelial Defect ◽  
Significant Difference

Background: At completion of transepithelial photorefractive keratectomy (t-PRK) surgery, the eye is usually fitted with a bandage contact lens to reduce discomfort and promote epithelial healing. This study aimed to compare the outcomes of eyes fitted with lotrafilcon B versus comfilcon A, silicone hydrogel bandage contact lenses after t-PRK for the correction of low to moderate myopia, with or without astigmatism. Methods: In this comparative, prospective study, patients with myopia < -6 D with or without astigmatism (< 1.75 D), who underwent t-PRK between January and June 2018, were randomly allocated to the lotrafilcon B and comfilcon A groups. Preoperative characteristics, including age, sex, eye treated, uncorrected visual acuity (UCVA), best-corrected visual acuity, mesopic pupil size, central corneal thickness, and refractive error were recorded. Postoperatively, pain score, UCVA, and corneal epithelial defect size on days 1, 4, and 7 were compared between the two groups. Results: Twenty-nine eyes were included in each group. Demographic characteristics and preoperative measurements were similar between the two groups. UCVA was significantly improved on day 7 as compared to day 1 in the comfilcon A group (P = 0.03), but remained the same in the lotrafilcon B group (P = 0.70) as on day 1 postoperatively. There was no significant difference in UCVA between the two groups at any follow-up visits (all P > 0.05). The pain score on the first postoperative day was significantly higher in the lotrafilcon B-fitted eyes than in the comfilcon A group (P < 0.001), but was significantly reduced in both groups compared to day 1 (both P < 0.001). The epithelial defect in the comfilcon A group was significantly greater than in the lotrafilcon B group (P < 0.001) at day 1 postoperatively, with significant improvement in both groups (both P < 0.001). Conclusions: Healing responses were better with lotrafilcon B than with comfilcon A bandage contact lenses. The patients had a greater mean pain score with lotrafilcon B than with comfilcon A lenses on the first postoperative day, yet the final outcome was comparable between the two groups. We did not encounter any postoperative complications related to contact lens wear. How to cite this article: Lotfy NM, Alasbali T, Alsharif AM, Al-Gehedan SM, Jastaneiah S, Al-Hazaimeh A, Ali H, Khandekar R. Comparison of the efficacy of lotrafilcon B and comfilcon A silicone hydrogel bandage contact lenses after transepithelial photorefractive keratectomy. Med Hypothesis Discov Innov Ophthalmol. 2021 Summer; 10(2): 1-7. https://doi.org/10.51329/mehdiophthal1420

scholarly journals “OKVision OKV-SL” customizable soft contact lenses fitting guide

The Eye ◽  
2020 ◽  
Vol 22 (4(132)) ◽  
pp. 61-68
Author(s):  
A. V. Myagkov ◽  
Zh. N. Poskrebysheva
Keyword(s):  
Visual Acuity ◽  
Contact Lens ◽  
Contact Lenses ◽  
Soft Contact ◽  
Soft Contact Lenses ◽  
Vision Correction

The purpose of this guide is to introduce ophthalmologists and optometrists to the basics of fitting of customizable soft contact lenses, which is an important knowledge that enhances practitioners’ skills and helps provide a high visual acuity for many patients.Material and methods. This guide sets forth the principles of calculation of contact lens parameters, defines parameters specific to customizable lenses as well as assessment of the fit and the rules of lens handling and care.Conclusions. Following the fitting guide ensures a successful vision correction with customizable soft contact lenses for both doctor and the patient.

scholarly journals Life on contact lenses: Exploiting a modern habitat

2009 ◽  
Vol 31 (4) ◽  
pp. 26-27
Author(s):  
James Lonnen
Keyword(s):  
Contact Lens ◽  
Contact Lenses ◽  
Risk Of Infection ◽  
Microbial Keratitis ◽  
Corneal Epithelial ◽  
Contact Lens Wear ◽  
The World ◽  
Micro Organisms ◽  
And Storage ◽  
Lens Wear

There are an estimated 125 million contact lens wearers across the world, and the majority experience few complications; however, it is well known that contact lens wear is a risk factor for microbial keratitis (infection of the cornea of the eye). Owing to the ubiquitous distribution of micro-organisms, it is extremely di cult to prevent them from colonizing contact lens storage cases. Bacteria, fungi and protozoa have all been found in contact lens storage cases; these micro-organisms can adhere to the contact lens, which then acts as a vector to transport the microbes on to the surface of the eye. Bacteria such as Pseudomonas aeruginosa, fungi such as Fusarium solani and the protazoan parasite Acanthamoeba–to name but a few–can cause infection of the corneal epithelial cells, which, if untreated, can lead to blindness. It is therefore essential that wearers clean and disinfect their contact lenses and storage cases e ectively to minimize the risk of infection.

Contact Lens Fitting in Patients with Keratoconus – A Retrospective Assessment of 200 Patients

2021 ◽  
Author(s):  
Kathrin Richter ◽  
Theresia Jullien ◽  
Ulrike Klühspies ◽  
Achim Langenbucher ◽  
Berthold Seitz ◽  
...  
Keyword(s):  
Visual Acuity ◽  
Contact Lens ◽  
Contact Lenses ◽  
Visual Outcome ◽  
Drop Out ◽  
Back Surface ◽  
Corneal Transplant ◽  
Wide Range ◽  
Fitting In ◽  
Contact Lens Fitting

Abstract Background and Purpose Nowadays, keratoconus (KC) is very well treatable in a stage-oriented manner. A wide range of designs and materials of contact lenses (CL) are available for the treatment of KC. The aim of this study was to evaluate the possibilities, the possible challenges and the visual outcome of lens fitting in KC eyes. Patients and Methods This retrospective study includes data from 200 patients who received a lens fitting trial in our contact lens service between 2006 and 2016. We documented ophthalmological parameters, the type of prescribed CL, the number of required trial lenses and possible causes of the failure of the lens fitting. Results The mean age at initial lens fitting was 33.9 ± 12.5 years. In 98.8% of the cases, the fitting was performed with rigid gas permeable lenses, in 90.1% with four-curve lenses. Of the total number of aspheric lenses prescribed, 87.5% were fitted in keratoconus stages “1” to “2” (topographic keratoconus classification; Oculus Keratograph). Back surface toric lenses or bitoric lenses were fitted to 61.7% in keratoconus stages “2 – 3” to “4”. Before patients received their final CL, a median of 2 trial lenses were required (max. 16). Mean visual acuity with lens correction was 0.8 ± 0.2 at the initial fitting, mean visual acuity with glasses correction was 0.5 ± 0.3. In 7.7% of the eyes, the KC lens fitting was discontinued due to the advanced stage of keratoconus, requiring a corneal transplant. Reasons for discontinuing contact lens fitting included lens intolerance (2.3%), application problems (0.3%) or acute corneal hydrops (0.3%). Discontinuation of lens wearing due to incompatibilities or application problems occurred in only four cases (1.1%) in the further course after lens fitting. Conclusions The use of contact lenses is an integral part of the stage-appropriate therapy of keratoconus. Good visual acuity can be achieved in all stages of keratoconus with a low drop-out rate. In most cases, the adjustment is carried out with rigid gas permeable lenses with a four-curve geometry. In initial stages, aspherical lenses may be sufficient. Toric lenses can be fitted in advanced stages when rotationally symmetrical lenses cannot achieve a satisfactory fit. If contact lenses have been successfully fitted, there are only a few cases in which patients abandon their contact lenses because of intolerance.

Whatever Happened to the Contact Lens as a Therapeutic Modality in Keratoconus?

2015 ◽  
Vol 09 (01) ◽  
pp. 19
Author(s):  
Ebru Toker ◽  
Keyword(s):  
Visual Acuity ◽  
Surgical Treatment ◽  
Contact Lens ◽  
Penetrating Keratoplasty ◽  
Contact Lenses ◽  
Therapeutic Modality ◽  
Treatment Modalities ◽  
Traditional Model ◽  
The Past ◽  
Functional Visual Acuity

Over the past decade the management of keratoconus has changed from the traditional model limited only to rigid gas permeable lenses or penetrating keratoplasty to an array of newer medical and surgical treatment modalities that focus on both prevention of disease progression and improvement of functional visual acuity. New design contact lenses such as keratoconus design rigid gas permeable lenses, soft lenses, hybrid and scleral lenses offer the advantage of better comfort together with improved vision. Fitting of these contemporary contact lenses may postpone or avoid the need for keratoplasty in most of the patients with keratoconus.

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