scholarly journals Refractive Use of Intrastromal Corneal Rings in Penetrating Keratoplasty

2017 ◽  
Vol 1 (2) ◽  
Keyword(s):  
Excimer Laser ◽  
Contact Lenses ◽  
Postoperative Management ◽  
Intraocular Lenses ◽  
Refractive Errors ◽  
Simple Fact ◽  
Visual Rehabilitation ◽  
Single Plane ◽  
Wide Range ◽  
Good Transparency

Intrascleral ring implants appeared in the 1950s with the aim of altering the curvature of the cornea promoting the correction of refractive errors. More recently, corneal rings have become more important in ophthalmology for the remodeling of irregular corneas, in which the excimer laser would be contraindicated. Corneal transplants have several indications and currently have a wide range of options depending on the underlying pathology. The postoperative management of keratoplasty, especially regarding refractive errors, can be very difficult. Some situations, such as anisometropia and intolerance of contact lenses, require surgical procedures for visual rehabilitation. Among the surgical option have the procedures with use the excimer laser, when the biomechanical conditions of the cornea allow, and in specific cases of contraindication the possibility of using the intrastromal ring implants, or even implants of intraocular lenses (phakic or pseudophakic). In 2011, the studies were started using large arc length segments with very positive results. They have numerous advantages among them the maintenance of every implant in a single plane allowing greater regularity of the surface of the cornea and with the advent of femtosecond laser the implant of these segments became possible. The option of a ring implant is based on the fact that the procedure has the possibility of being reversible without corneal consumption. Keratoplasty is aimed at obtaining the visual rehabilitation of the patients, so the simple fact of obtaining a good transparency of the corneal button can not be considered as success, therefore the final visual acuity should always give the final word on the result.

scholarly journals On Classification and Application of Monovision Technique for Excimer Laser Correction and on Possible of Preliminary Target Refraction Modeling in Patients with Primary Myopia, Astigmatism, Anisometropia and Presbyopia

2020 ◽  
Vol 17 (4) ◽  
pp. 739-745
Author(s):  
E. I. Belikova ◽  
T. V. Perova
Keyword(s):  
Excimer Laser ◽  
Contact Lenses ◽  
Careful Examination ◽  
Refractive Errors ◽  
Soft Contact ◽  
Visual Rehabilitation ◽  
Planning Stage ◽  
Soft Contact Lenses ◽  
Number Of Patients ◽  
Target Refraction

The combination of such refractive errors as high and medium astigmatism with anisometropia and presbyopia considerably reduces patients’ standard of living, first of all because methods of the correction stated are very limited. Spectacle correction is, as a rule, extremely uncomfortable or impossible in case of an anisometropia of more than 2.0 dioptres and a high degree of astigmatism; opportunities of contact lenses correction are limited in case of an astigmatism of more than 2.5 dioptres. Therefore these patients are often deprived of adequate visual rehabilitation and prefer not to use means of optical vision correction at all which considerably lowers their quality of life and can be the reason of asthenopia, violation of binocular vision and decrease in fusional reserves. This problem is aggravated with the development of a presbyopia when patients get older. The first manifestations of it reveal themselves in such patients earlier than in emmetrops, their age-mates. Excimer laser technology development has made it possible to help a large number of patients with the most severe refractive disorders, but these techniques still have significant limitations in patients with presbyopia, especially in case of a patient’s strong need for keen eyesight at a close distance. In addition, these patients require a particularly careful examination and preliminary modeling of target refraction at the planning stage of a surgical intervention, for which we use soft contact lenses in our practice. Target refraction modeling with spectacle lenses does not always allow to adequately predict the patient satisfaction with the results of correction. We consider the method of target refraction modeling using soft contact lenses to be the most accurate for this objective; it is widely used in our clinic. This technique is especially effective in patients with presbyopia, who are planning excimer laser correction of the most common types of refractive errors. The article presents a clinical case of binocular excimer laser correction of a high and medium degree compound myopic astigmatism in a patient with anisometropia and presbyopia, which was performed in two stages using LASIK (Custom Q) technology after the preliminary target refraction modeling with the use of soft contact lenses.

scholarly journals MODERN APPROACHES TO DYSPHOTOPSIA ANALYSIS, ASSESSMENTOF PATIENT SATISFACTION AND SPECTACLE INDEPENDENCE AFTER MULTIFOCALINTRAOCULAR CORRECTION: REVIEW

2017 ◽  
Vol 72 (5) ◽  
pp. 355-364 ◽  
Author(s):  
T. A. Morozova ◽  
T. Z. Kerimov
Keyword(s):  
Patient Satisfaction ◽  
Clinical Studies ◽  
Contact Lenses ◽  
Intraocular Lenses ◽  
Modern Approach ◽  
Multifocal Intraocular Lenses ◽  
Wide Range ◽  
High Level ◽  
Different Levels

The core target of multifocal IOLs implantation is to provide advanced visual quality at different distances without spectacle or contact lenses that can be valuable when monofocal IOLs are implanted. Patients with monofocal IOLs need spectacles or contact lenses for the near and intermediate distance's vision. Multifocal intraocular lenses due to the optical part construction provide spectacle independence for patients in the postoperative period. The aim of this review was to analyze the modern approach to the several aspects of multifocal intraocular correction: spectacle independence, dysphotopsia, patient satisfaction. Patients’ questionnaire after surgery provides the data for evaluation of the quality of life, vision satisfaction at all range of distances on different levels of illumination, and patient activities of daily living. During the long period, a photic phenomenon (dysphotopsia) had been discussed in the literature as the principal reason for decrease of patients satisfaction with the treatment and lens explantation. Recently, high grade of spectacle independence and low risk of photic phenomena after modern multifocal IOLs implantation determine high-level patient satisfaction after cataract surgery. Multifocal intraocular correction is the effective technology for restoring passive accommodation that the wide range of the clinical studies proved. This review analyzes 33 studies (32 clinical studies and 1 metaanalisis) published in international peer-reviewed targeted titles.

scholarly journals Implantable Contact Lenses in Keratoconus

2016 ◽  
Vol 5 (1) ◽  
pp. 17-20 ◽  
Author(s):  
Suruchi Gupta
Keyword(s):  
Surgical Treatment ◽  
Contact Lenses ◽  
Review Article ◽  
Social Consequences ◽  
Intraocular Lenses ◽  
Cross Linking ◽  
Visual Rehabilitation ◽  
Phakic Intraocular Lenses ◽  
Collagen Cross Linking ◽  
Corneal Collagen

ABSTRACT Keratoconus is a progressive inherited disorder with varying economic and social consequences. Varying modalities of visual rehabilitation such as spectacles, contact lenses, surgical treatment in the form of corneal collagen cross-linking to arrest progression, and surface refractive procedures such as photorefractive keratectomy, implantation of phakic intraocular lenses (IOLs), or Intacs have been undertaken with varying results. This review article focuses on the introduction of phakic IOLs/implantable contact lenses in keratoconus. Thorough research was made on PubMed, Google, HINARI, and related sites for all related material, and it was thoroughly studied to draft this article. How to cite this article Gupta S. Implantable Contact Lenses in Keratoconus. Int J Kerat Ect Cor Dis 2016;5(1):17-20.

scholarly journals Pseudophakic Presbyopic Corrections

2021 ◽  
Author(s):  
Georgios Labiris ◽  
Eirini-Kanella Panagiotopoulou
Keyword(s):  
Contact Lenses ◽  
Negative Impact ◽  
Productivity Loss ◽  
Life Quality ◽  
Postoperative Management ◽  
Primary Objective ◽  
Intraocular Lenses ◽  
Treatment Modalities ◽  
Refractive Outcomes ◽  
Age Related

Presbyopia is a prevalent productivity-reducing, age-related visual disorder that results in a progressive near vision impairment. Conventional treatment modalities (ie. presbyopic spectacles or contact lenses) are associated with poor acceptance, productivity loss and negative impact on life quality. However, a variety of surgical methods are available to address presbyopia; among them, multifocal and multifocal toric intraocular lenses (IOLs) and monovision techniques. For the best possible refractive outcomes, the overall management of presbyopic patients is necessary. Specifically, patient selection according to personality and daily activities, topography, aberrometry, astigmatism, pupil and fundus assessment, ophthalmic surface, and premium lens selection should be taken into consideration. Additionally, image-guided surgery could increase the accuracy in multifocal/multifocal toric IOL implantation, and optimize the refractive outcome increasing patient satisfaction. Primary objective of this chapter is to analyze the fundamental preoperative, intraoperative and postoperative management of patients that undergo pseudophakic presbyopic corrections with conventional or digital-marking assisted techniques.

Clinical manifestations and diagnosis of keratoconus. Treatment of iatrogenic keratoconus

2020 ◽  
pp. 37-42
Author(s):  
Fedor Ermolyuk
Keyword(s):  
Research Methods ◽  
Contact Lenses ◽  
Correct Diagnosis ◽  
Clinical Manifestations ◽  
Refractive Errors ◽  
Dry Eyes ◽  
Advanced Stages ◽  
Dystrophic Disease ◽  
Iatrogenic Origin ◽  
Binocular Diplopia

Keratoconus is a dystrophic disease of the cornea, when it is thinned with the formation of a conus-like protrusion (protrusion of the cornea). This disease belongs to the group of keratectasia, it has a multifactorial nature and occurs in approximately 25 % of all corneal pathologies. The disease can be either primary, which is based on dystrophic changes in the cornea, or secondary, which develops against the background of prenatal keratitis. Keratoconus of iatrogenic origin, which develops as a result of refractive eye microsurgery, has become widespread during the last 20 years. Most often primary keratoconus manifests during puberty, progresses to 30–40 years, after which its development slows down. An early clinical manifestation of this corneal pathology is a progressive decrease in visual acuity, development of double vision (binocular diplopia) with the development of a strong headache against this background. Monocular polyopia — images and symbols with multiple contours — develops subsequently. Severe dry eyes, itching, photophobia appear in advanced stages. Diagnosis of keratoconus in some cases can be a significant difficulty, since the use of conventional research methods only allow to suspect refractive errors in the form of myopia or astigmatism. It is necessary to take into account the impossibility of correcting visual impairment using conventional methods — glasses or contact lenses — to make correct diagnosis. As a rule, diagnosis of keratoconus requires use of expanded spectrum of instrumental research methods.

Types of refractive errors and methods for their diagnosis

2020 ◽  
pp. 30-36
Author(s):  
Olga Lemzyakova
Keyword(s):  
Optical System ◽  
Contact Lenses ◽  
Vision Impairment ◽  
Refractive Errors ◽  
Vision Correction ◽  
Light Rays ◽  
Different Types ◽  
Almost All ◽  
Degrees Of Severity ◽  
The Brain

Refraction of the eye means its ability to bend (refract) light in its own optical system. In a normal state, which is called emmetropia, light rays passing through the optical system of the eye focus on the retina, from where the impulse is transmitted to the visual cortex of the brain and is analyzed there. A person sees equally well both in the distance and near in this situation. However, very often, refractive errors develop as a result of various types of influences. Myopia, or short-sightedness, occurs when the light rays are focused in front of the retina as a result of passing through the optical system of the eye. In this case, a person will clearly distinguish close objects and have difficulties in seeing distant objects. On the opposite side is development of farsightedness (hypermetropia), in which the focusing of light rays occurs behind the retina — such a person sees distant objects clearly, but outlines of closer objects are out of focus. Near vision impairment in old age is a natural process called presbyopia, it develops due to the lens thickening. Both myopia and hypermetropia can have different degrees of severity. The variant, when different refractive errors are observed in different eyes, is called anisometropia. In the same case, if different types of refraction are observed in the same eye, it is astigmatism, and most often it is a congenital pathology. Almost all of the above mentioned refractive errors require correction with spectacles or use of contact lenses. Recently, people are increasingly resorting to the methods of surgical vision correction.

Rigid Gas-Permeable Contact Lenses for Visual Rehabilitation of Traumatized Eyes in Children

Cornea ◽  
2014 ◽  
Vol 33 (5) ◽  
pp. 486-489 ◽  
Author(s):  
Zia Sultan Pradhan ◽  
Rashmi Mittal ◽  
Pushpa Jacob
Keyword(s):  
Contact Lenses ◽  
Visual Rehabilitation

Possibilities of scleral lenses for visual rehabilitation of patients with corneal scars

2021 ◽  
pp. 157-161
Author(s):  
O.I. Ryabenko ◽  
◽  
O.M. Selina ◽  
E.M. Tananakina ◽  
◽  
...  
Keyword(s):  
Visual Acuity ◽  
Contact Lenses ◽  
Efficacy And Safety ◽  
Visual Rehabilitation ◽  
Optical Correction ◽  
Vision Correction ◽  
Post Traumatic ◽  
Key Words Cornea ◽  
Irregular Astigmatism ◽  
Spectacle Correction

Purpose. To analyze the efficacy and safety of SCL in patients with corneal cicatricial changes and other concomitant conditions. Material and мethods. The study included 19 patients (20 eyes) with cicatricial deformity of the cornea of various etiology, who were fitted with scleral contact lenses. Results and discussions. The use of SCL is possible in post-traumatic pathology, such as corneoscleral scars with or without aphakia, as well as after keratitis with an outcome in cicatricial deformity, cicatricial changes after a burn. A significant increase in visual acuity compared with spectacle correction has been proven. Depending on the topography of the scar, it is possible to select scleral lenses such as Oblate and Prolate, as well as with different versions of the support zone: both toric and quadratic. Conclusion. Scleral lenses can be successfully used for optical correction in patients with cicatricial changes in the cornea and other concomitant post-traumatic conditions of ineffectiveness of other methods of visual rehabilitation. Key words: cornea, lenses, vision correction, contact lenses, visual rehabilitation, scleral lenses, corneal scars, post-traumatic astigmatism, aphakia, keratitis, toric lenses, quadratic lenses, astigmatism, irregular cornea, regular cornea, regular astigmatism, irregular cornea, irregular astigmatism, prolate, oblate.

Hard and soft contact lenses: a comparison

1974 ◽  
Vol 12 (25) ◽  
pp. 97-99
Keyword(s):  
Contact Lenses ◽  
Refractive Errors ◽  
Soft Contact ◽  
Soft Contact Lenses

Contact lenses may be used to correct refractive errors, to treat diseased eyes, and to improve the appearance of disfigured eyes. Hard and soft lenses are now available. They have different properties and their relative merits depend upon the purpose for which the lens is required.

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