Tangential and sagittal curvature from the normals computed by the null screen method in corneal topography

Measurement and correction of misalignments in corneal topography using the null-screen method

OSA Continuum ◽

10.1364/osac.409933 ◽

2020 ◽

Author(s):

Manuel Campos-Garcia ◽

Daniel Aguirre ◽

Victor Moreno-Oliva ◽

Oliver Huerta-Carranza ◽

Victor de Emanuel Armengol-Cruz

Keyword(s):

Corneal Topography ◽

Screen Method

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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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VARIATIONS IN CORNEAL TOPOGRAPHY

Clinical and Experimental Optometry ◽

10.1111/j.1444-0938.1973.tb00700.x ◽

1973 ◽

Vol 56 (11) ◽

pp. 399-413

Author(s):

B. A. J. CLARK

Keyword(s):

Corneal Topography

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Evaluation of the meridional longitudinal spherical aberration from corneal topography measurements

Optik ◽

10.1016/j.ijleo.2009.09.011 ◽

2010 ◽

Vol 121 (24) ◽

pp. 2269-2272

Author(s):

Gloria Rueda ◽

Javier Alda ◽

Eusebio Bernabeu

Keyword(s):

Spherical Aberration ◽

Corneal Topography

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Importance of corneal topography in surgical planning for toric intraocular lenses

Journal of Cataract & Refractive Surgery ◽

10.1097/j.jcrs.0000000000000387 ◽

2020 ◽

Vol 46 (10) ◽

pp. 1450-1450

Author(s):

Hossein Aghaei ◽

Acieh Es'haghi

Keyword(s):

Surgical Planning ◽

Corneal Topography ◽

Intraocular Lenses

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Severe Corneal Morphological Alterations after Excimer Laser Surface Ablation for a High Astigmatism

Case Reports in Ophthalmology ◽

10.1159/000516311 ◽

2021 ◽

pp. 492-496

Author(s):

Anna M. Roszkowska ◽

Giovanni W. Oliverio ◽

Giuseppe A. Signorino ◽

Mario Urso ◽

Pasquale Aragona

Keyword(s):

Excimer Laser ◽

Corneal Stroma ◽

Corneal Topography ◽

Laser Surface ◽

Slit Lamp ◽

Slit Lamp Examination ◽

Morphological Alterations ◽

Surface Ablation ◽

Confocal Images

We report long-term alterations of anterior corneal stroma after excimer laser surface ablation for a high astigmatism. The patient claimed progressive visual loss in his right eye (RE) during the last 3 years after bilateral laser-assisted subepithelial keratectomy (LASEK) surgery. His examination comprised visual acuity (UDVA and CDVA), slit-lamp examination, corneal topography and tomography, AS-OCT, and confocal microscopy. The UDVA was 0.1 in his RE and 1.0 in the left eye. The CDVA in the RE was 0.8. The slit-lamp examination showed a stromal lesion in the inferior paracentral corneal zone, with multiple vertical tissue bridges and severe thinning. Corneal topography and tomography showed central flattening with inferior steepening and severe alteration in elevation maps. AS-OCT showed void areas in the anterior stroma with thinning of the underlying tissue, and confocal images were not specific. In this case, progressive corneal steepening and thinning that manifest topographically as inferior ectasia occurred in correspondence to the singular stromal alterations after LASEK.

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