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Clinical applications of anterior segment optical coherence tomography.

Lim SH - J Ophthalmol (2015)

Bottom Line: Anterior segment optical coherence tomography (AS-OCT) was recently developed and has become a crucial tool in clinical practice.AS-OCT is a noncontact imaging device that provides the detailed structure of the anterior part of the eyes.The author also presents some interesting cases demonstrated via AS-OCT.

View Article: PubMed Central - PubMed

Affiliation: Department of Ophthalmology, Yeungnam University College of Medicine, Daegu, Republic of Korea ; Department of Ophthalmology, Daegu Veterans Health Service Medical Center, 60 Wolgok-ro, Dalseo-Gu, Daegu 704-802, Republic of Korea.

ABSTRACT
Anterior segment optical coherence tomography (AS-OCT) was recently developed and has become a crucial tool in clinical practice. AS-OCT is a noncontact imaging device that provides the detailed structure of the anterior part of the eyes. In this review, the author will discuss the various clinical applications of AS-OCT, such as the normal findings, tear meniscus measurement, ocular surface disease (e.g., pterygium, pinguecula, and scleromalacia), architectural analysis after cataract surgery, post-LASIK keratectasia, Descemet's membrane detachment, evaluation of corneal graft after keratoplasty, corneal deposits (corneal dystrophies and corneal verticillata), keratitis, anterior segment tumors, and glaucoma evaluation (angle assessment, morphological analysis of the filtering bleb after trabeculectomy, or glaucoma drainage device implantation surgery). The author also presents some interesting cases demonstrated via AS-OCT.

No MeSH data available.


Related in: MedlinePlus

AS-OCT image of post-LASIK keratectasia. Horizontal OCT section demonstrating flap thickness (FT) and residual stromal bed thickness (RSB) (a), pachymetry map (b), and asymmetry parameters (c).
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fig6: AS-OCT image of post-LASIK keratectasia. Horizontal OCT section demonstrating flap thickness (FT) and residual stromal bed thickness (RSB) (a), pachymetry map (b), and asymmetry parameters (c).

Mentions: The detection of an ectatic change also has clinical pitfalls. Li et al. [28] provided several parameters for detecting the asymmetry and global or focal thinning, as follows: (1) I-S (the difference between the average thickness of the inferior octant and that of the superior octant) >31 μm; (2) IT-SN (the difference between the inferotemporal octant and the superonasal octant) >48 μm; (3) minimum <492 μm; (4) minimum-maximum <−63 μm; and (5) the thinnest region of the cornea is located outside the central 2 mm area. They suggested that one abnormal parameter provides suspect keratoconus, and two or more abnormal parameters provide a definite diagnosis (Figure 6).


Clinical applications of anterior segment optical coherence tomography.

Lim SH - J Ophthalmol (2015)

AS-OCT image of post-LASIK keratectasia. Horizontal OCT section demonstrating flap thickness (FT) and residual stromal bed thickness (RSB) (a), pachymetry map (b), and asymmetry parameters (c).
© Copyright Policy - open-access
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC4363581&req=5

fig6: AS-OCT image of post-LASIK keratectasia. Horizontal OCT section demonstrating flap thickness (FT) and residual stromal bed thickness (RSB) (a), pachymetry map (b), and asymmetry parameters (c).
Mentions: The detection of an ectatic change also has clinical pitfalls. Li et al. [28] provided several parameters for detecting the asymmetry and global or focal thinning, as follows: (1) I-S (the difference between the average thickness of the inferior octant and that of the superior octant) >31 μm; (2) IT-SN (the difference between the inferotemporal octant and the superonasal octant) >48 μm; (3) minimum <492 μm; (4) minimum-maximum <−63 μm; and (5) the thinnest region of the cornea is located outside the central 2 mm area. They suggested that one abnormal parameter provides suspect keratoconus, and two or more abnormal parameters provide a definite diagnosis (Figure 6).

Bottom Line: Anterior segment optical coherence tomography (AS-OCT) was recently developed and has become a crucial tool in clinical practice.AS-OCT is a noncontact imaging device that provides the detailed structure of the anterior part of the eyes.The author also presents some interesting cases demonstrated via AS-OCT.

View Article: PubMed Central - PubMed

Affiliation: Department of Ophthalmology, Yeungnam University College of Medicine, Daegu, Republic of Korea ; Department of Ophthalmology, Daegu Veterans Health Service Medical Center, 60 Wolgok-ro, Dalseo-Gu, Daegu 704-802, Republic of Korea.

ABSTRACT
Anterior segment optical coherence tomography (AS-OCT) was recently developed and has become a crucial tool in clinical practice. AS-OCT is a noncontact imaging device that provides the detailed structure of the anterior part of the eyes. In this review, the author will discuss the various clinical applications of AS-OCT, such as the normal findings, tear meniscus measurement, ocular surface disease (e.g., pterygium, pinguecula, and scleromalacia), architectural analysis after cataract surgery, post-LASIK keratectasia, Descemet's membrane detachment, evaluation of corneal graft after keratoplasty, corneal deposits (corneal dystrophies and corneal verticillata), keratitis, anterior segment tumors, and glaucoma evaluation (angle assessment, morphological analysis of the filtering bleb after trabeculectomy, or glaucoma drainage device implantation surgery). The author also presents some interesting cases demonstrated via AS-OCT.

No MeSH data available.


Related in: MedlinePlus