Mesopic quality of vision after accelerated 18 mW/cm2 corneal cross-linking: Mid-term results

Purpose: To evaluate an original approach for treating corneal ectasia and irregular astigmatism secondary to penetrating trauma in a pediatric patient. Case report: An 11 year old patient had a penetrating trauma in right eye when he was two and the refractive error was +1.50 diopters sphere −6.00 diopters cylinder axis 95°. To correct irregular astigmatism, the patient underwent simultaneous transepithelial topographic-guided laser Central Corneal Remodeling (CCR) and Corneal Cross-linking (CXL) in the attempt to regularize corneal ectasia and to improve the quality of vision. Uncorrected and Corrected Distance Visual Acuity were measured using Efficacy and Safety indexes; objective and subjective qualities of vision were evaluated using respectively corneal morphological irregularity index and National Eye Institute Visual Function questionnaires. Conclusions: Twelve month follow up suggests that simultaneous CCR and CXL could be effective to improve the quality of vision and to halt the progression of post-traumatic ectasia in pediatric patients.

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Corneal Physiology and Responses to Cross-Linking and Intracorneal Rings in Keratoconus

International Journal of Keratoconus and Ectatic Corneal Diseases ◽

10.5005/jp-journals-10025-1001 ◽

2012 ◽

Vol 1 (1) ◽

pp. 1-6

Keyword(s):

Progressive Disease ◽

Cross Linking ◽

Arc Length ◽

Quality Of Vision ◽

Long Time ◽

Ring Segment ◽

Corneal Opacities ◽

New Treatment ◽

Treatment Alternatives

ABSTRACT Keratoconus is a noninflammatory, usually, bilateral progressive disease. It is a pathology characterized by a progressive thinning and ectasia of the stroma that results in cone-shaped cornea. In advanced keratoconus with corneal opacities, keratoplasty, can be the only surgical alternative for a long time. Recently, new treatment alternatives were developed in keratoconus treatment, such as intracorneal ring segments and corneal cross- linking. Intracorneal ring segment acts as spacer elements between the bundles of corneal lamellae producing a shortening of the central arc length. Corneal cross-linking treatment increases the stiffness of the cornea. Several studies reported that collagen cross-linking can delay or stop keratoconus progression and produce better quality of vision. How to cite this article Kiliç A. Corneal Physiology and Responses to Cross-Linking and Intracorneal Rings in Keratoconus. Int J Keratoco Ectatic Corneal Dis 2012;1(1):1-6.

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The Current Situation in Chemical Stabilization of Biological Materials

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100093912 ◽

1972 ◽

Vol 30 ◽

pp. 132-133

Author(s):

John H. Luft

Keyword(s):

Electron Microscopy ◽

Electron Microscope ◽

Osmium Tetroxide ◽

Molecular Level ◽

Cross Linking ◽

Chemical Stabilization ◽

Specimen Preparation ◽

Sufficient Condition ◽

Radio Telescopes

With information processing devices such as radio telescopes, microscopes or hi-fi systems, the quality of the output often is limited by distortion or noise introduced at the input stage of the device. This analogy can be extended usefully to specimen preparation for the electron microscope; fixation, which initiates the processing sequence, is the single most important step and, unfortunately, is the least well understood. Although there is an abundance of fixation mixtures recommended in the light microscopy literature, osmium tetroxide and glutaraldehyde are favored for electron microscopy. These fixatives react vigorously with proteins at the molecular level. There is clear evidence for the cross-linking of proteins both by osmium tetroxide and glutaraldehyde and cross-linking may be a necessary if not sufficient condition to define fixatives as a class.

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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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