Study of tear film optics and its impact on quality of vision

The aim of the study was to evaluate the effectiveness of multifocal contact lens correction in patients with presbyopia and myopic refractive error. The study involved 45patients with myopia ranging in age from 43 to 56years in conditions of habitual monofocal contact lens correction, a month after the selection and wearing multifocal contact lenses. Contact correction was carried out according to standard procedures taking into account the accuracy of contact lens fitting, with carrying out functional tests for the “dry eye” syndrome and evaluation of corneal epithelial thickness (Optovue, USA). The as-sessment of the following parameters of visual perception was made: far, near and middle distance (monocular and binocular) visual acuity, the spatial contrast sensitivity, stereovision (I & II Lang test), the area of binocular interaction field (binarymeter), the quality of vision (VF-14 test ). The use of multifocal contact lenses for the correction of presbyopia with the initial myopic refraction ensures high functional results at different distances. Patients with a myopic refraction, previously used contact lenses, easy pass to multifocal correction option. The greatest satisfaction by achieved vision noted in those patients who had achieved refraction (–)0.5diopters. In the selection of contact lenses in older patients the thickness of the corneal epithelium and tear film validity must be taken into account.

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Structural and Molecular Tear Film Changes in Glaucoma

Current Medicinal Chemistry ◽

10.2174/0929867325666181009153212 ◽

2019 ◽

Vol 26 (22) ◽

pp. 4225-4240 ◽

Cited By ~ 5

Author(s):

Rodolfo Mastropasqua ◽

Luca Agnifili ◽

Leonardo Mastropasqua

Keyword(s):

Ocular Surface ◽

Tear Film ◽

Meibomian Gland ◽

Eye Drops ◽

Potential Candidate ◽

Lipid Layer ◽

Inflammatory Status ◽

Quality Of Vision ◽

Aqueous Layer

: The Tear Film (TF) is a trilaminar and dynamic fluid covering the entire Ocular Surface (OS), consisting of a mucus, aqueous, and lipid layer deeply interacting between them. Because of its structure and functions, TF plays a pivotal role in the preservation of the OS integrity and the quality of vision. Medical therapy for glaucoma is recognized to profoundly disturb the OS homeostasis by altering all components of the ocular surface unit, including TF. The presence of preservatives, the number of daily eye drops instillations, and the duration of therapy are the main contributors to TF changes. From the physio-pathological side, TF alterations are induced by toxic and allergic mechanisms and result from goblet cell and Meibomian gland loss, dysfunction of accessory lacrimal glands, and epithelial disruption. : In detail, TF changes are represented by mucus layer thinning, reduced mucin concentration, aqueous layer volume reduction, and lipid layer thinning with increased tear evaporation. Hyper- osmolarity and instability represent the main hallmarks of these changes and are an expression of a iatrogenic form of dry eye. TF undergoes also molecular modifications that primarily reflect a therapy- or disease-induced inflammatory status of the OS. Over the last years, this field of research aimed a progressively growing interest since molecular variations may be considered as potential candidate biomarkers of glaucoma. The aim of this review is to report the main TF changes occurring during glaucoma, exploring the relationship they may have with the glaucoma-related ocular surface disease and the patient quality of life, and their utility as potential biomarkers of disease.

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Straylight as measure for quality of vision and the tear film

Acta Ophthalmologica ◽

10.1111/j.1755-3768.2011.4473.x ◽

2011 ◽

Vol 89 (s248) ◽

pp. 0-0

Author(s):

TJTP VAN DEN BERG

Keyword(s):

Tear Film ◽

Quality Of Vision

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Effects of tear film dynamics on quality of vision

British Journal of Ophthalmology ◽

10.1136/bjophthalmol-2018-312333 ◽

2018 ◽

Vol 102 (12) ◽

pp. 1615-1620 ◽

Cited By ~ 11

Author(s):

Shizuka Koh ◽

Cynthia I Tung ◽

Yasushi Inoue ◽

Vishal Jhanji

Keyword(s):

Dry Eye ◽

Current Knowledge ◽

Tear Film ◽

Optical Quality ◽

Eye Drops ◽

Wavefront Sensors ◽

Wavefront Aberrations ◽

Quality Of Vision ◽

Definition Of

The precorneal tear film is maintained by blinking and exhibits different phases in the tear cycle. The tear film serves as the most anterior surface of the eye and plays an important role as a first refractive component of the eye. Alterations in tear film dynamics may cause both vision-related and ocular surface-related symptoms. Although the optical quality associated with the tear film dynamics previously received little attention, objective measurements of optical quality using wavefront sensors have enabled us to quantify optical aberrations induced by the tear film. This has provided an objective method for assessing reduced optical quality in dry eye; thus, visual disturbances were included in the definition of dry eye disease in the 2007 Dry Eye Workshop report. In addition, sequential measurements of wavefront aberrations have provided us with valuable insights into the dynamic optical changes associated with tear film dynamics. This review will focus on the current knowledge of the mechanisms of wavefront variations that are caused by different aspects of tear film dynamics: specifically, quality, quantity and properties of the tear film, demonstrating the respective effects of dry eye, epiphora and instillation of eye drops on the quality of vision.

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The visualization and assessment of the anterior surface of the cornea using video keratotopography

The Eye ◽

10.33791/2222-4408-2020-2-36-43 ◽

2020 ◽

Vol 22 (130) ◽

pp. 36-43

Author(s):

Gulnara Andrienko

Keyword(s):

Contact Lenses ◽

Corneal Topography ◽

Topographic Maps ◽

Specific Situation ◽

Main Method ◽

Pathological Conditions ◽

Quality Of Vision ◽

Corneal Shape ◽

Color Map

Corneal topography is the main method for assessing the regularity of the surface of the cornea. Corneal irregularity leads to a deterioration in its refractive properties and a decrease in the quality of vision. Learning the basics of corneal topography will help determine the choice of a color map for a specific situation, as well as understand and analyze the data associated with these maps. This article describes the main types of topographic maps, various patterns of corneal shape in normal and pathological conditions and how to use the data obtained to design and fit contact lenses. Despite the fact that images may vary depending on topographers used, the information presented in this article is universal.

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Evaluation of Quality of Vision and Spectacle Independence With the AcrySof® Panoptix® Intraocular Lens

Case Medical Research ◽

10.31525/ct1-nct04124952 ◽

2019 ◽

Author(s):

Keyword(s):

Intraocular Lens ◽

Quality Of Vision

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Photo demonstration of quality of vision with intact posterior capsule

American Intra-Ocular Implant Society Journal ◽

10.1016/s0146-2776(85)80071-9 ◽

1985 ◽

Vol 11 (4) ◽

pp. 393-395 ◽

Cited By ~ 1

Author(s):

John J. Alpar ◽

James J. Spurlock

Keyword(s):

Posterior Capsule ◽

Quality Of Vision

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Objective and subjective evaluation of trifocal diffractive intraocular Lens after cataract extraction with phacoemulsification: a prospective clinical study

BMC Ophthalmology ◽

10.1186/s12886-021-01937-z ◽

2021 ◽

Vol 21 (1) ◽

Author(s):

Ahmed A. Zein El-Dein ◽

Ahmed Elmassry ◽

Hazem M. El-Hennawi ◽

Ehab F. Mossallam

Keyword(s):

Visual Acuity ◽

Contrast Sensitivity ◽

Intraocular Lens ◽

Subjective Evaluation ◽

Cataract Extraction ◽

Prospective Clinical Study ◽

Gradual Change ◽

Quality Of Vision ◽

Defocus Curve

Abstract Background This study aimed to assess visual outcomes, quality of vision and patients’ satisfaction of a trifocal diffractive intraocular lens after cataract surgery with phacoemulsification. Results The study included 36 eyes that underwent implantation of trifocal diffractive intraocular lens (IOL). The residual mean postoperative spherical equivalent was − 0.40 ± 0.29 diopters. Mean Uncorrected distance visual acuity was 0.80 ± 0.16 decimal (snellen equivalent 25 ft) while mean Uncorrected intermediate visual acuity was 0.82 ± 0.31 decimal (snellen equivalent 25 ft) and mean Uncorrected near visual acuity (UCNVA) was 0.87 ± 0.20 decimal (snellen equivalent 23 ft). In defocus curve, there was infinitesimal gradual change between the three foci. Contrast sensitivity was just below the inferior limit of normal. Conclusion Trifocal diffractive IOL created a true intermediate focus proved by VA and defocus curve and better quality of vision assessed by contrast sensitivity and high order aberration. Moreover, it was safe and effective for correcting distance and near vision in these patients. Most of the patients were very satisfied and achieved spectacle independence. Trial registration Registration number and date: NCT04465279 on July 10, 2020.

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