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Bilateral circumscribed posterior keratoconus: visualization by ultrasound biomicroscopy and slit-scanning topography analysis.

Rejdak R, Nowomiejska K, Haszcz D, Jünemann AG - J Ophthalmol (2012)

Bottom Line: This paper documents a rare nonprogressive developmental disorder-bilateral circumscribed posterior keratoconus-in a 60-year-old man referred for a cataract surgery.For the first time ultrasound biomicroscopy was used to visualise the local anterior bulging of the posterior corneal surface with concomitant thinning of the stroma.The amount of localized posterior depression, corneal thickness and the refractive power of both the posterior and anterior corneal curvature were measured using slit-scanning topography analysis (Orbscan).

View Article: PubMed Central - PubMed

Affiliation: Department of Ophthalmology, Medical University of Lublin, 20-059 Lublin, Poland.

ABSTRACT
This paper documents a rare nonprogressive developmental disorder-bilateral circumscribed posterior keratoconus-in a 60-year-old man referred for a cataract surgery. For the first time ultrasound biomicroscopy was used to visualise the local anterior bulging of the posterior corneal surface with concomitant thinning of the stroma. The amount of localized posterior depression, corneal thickness and the refractive power of both the posterior and anterior corneal curvature were measured using slit-scanning topography analysis (Orbscan).

No MeSH data available.


Related in: MedlinePlus

Slit-scanning topography analysis of the posterior corneal curvature (Orbscan) shows the circumscribed protrusion of the posterior surface, located paracentrally inferiorly. The color code indicates a “bulging” of about 75 μm.
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fig6: Slit-scanning topography analysis of the posterior corneal curvature (Orbscan) shows the circumscribed protrusion of the posterior surface, located paracentrally inferiorly. The color code indicates a “bulging” of about 75 μm.

Mentions: Slitlamp examination revealed a bilateral paracentrally localized depression of the posterior curvature measuring 3 mm in diameter. There was scarring in the overlying corneal stroma (Figures 1, 2, and 3). An intraepithelial iron line was noted at the base of the lesion temporally. A few retrocorneal melanin granules were present (Figure 3). An irregular mosaic-like pattern was noted using retroillumination (Figure 4). The posterior depression was clearly detectable using ultrasound biomicroscopy (Humphrey, Zeiss, Oberkochen) (Figure 5) and slit-scanning topography analysis (Orbscan, Bausch and Lomb) (Figure 6). The amount of localized posterior depression was 75 μm as indicated by topography. Corneal thickness measured 450 μm within the lesion and 540 μm in the adjacent healthy cornea using the Orbscan system. The refractive power of both the posterior and anterior corneal curvature was 50 to 56 diopters within the paracentral area. Otherwise, both eyes were unremarkable. Following phacoemulsification and posterior chamber lens implantation visual acuity increased to 20/50 in the left eye. The examination of the fundus and vitreous revealed no pathological findings.


Bilateral circumscribed posterior keratoconus: visualization by ultrasound biomicroscopy and slit-scanning topography analysis.

Rejdak R, Nowomiejska K, Haszcz D, Jünemann AG - J Ophthalmol (2012)

Slit-scanning topography analysis of the posterior corneal curvature (Orbscan) shows the circumscribed protrusion of the posterior surface, located paracentrally inferiorly. The color code indicates a “bulging” of about 75 μm.
© Copyright Policy - open-access
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC3307006&req=5

fig6: Slit-scanning topography analysis of the posterior corneal curvature (Orbscan) shows the circumscribed protrusion of the posterior surface, located paracentrally inferiorly. The color code indicates a “bulging” of about 75 μm.
Mentions: Slitlamp examination revealed a bilateral paracentrally localized depression of the posterior curvature measuring 3 mm in diameter. There was scarring in the overlying corneal stroma (Figures 1, 2, and 3). An intraepithelial iron line was noted at the base of the lesion temporally. A few retrocorneal melanin granules were present (Figure 3). An irregular mosaic-like pattern was noted using retroillumination (Figure 4). The posterior depression was clearly detectable using ultrasound biomicroscopy (Humphrey, Zeiss, Oberkochen) (Figure 5) and slit-scanning topography analysis (Orbscan, Bausch and Lomb) (Figure 6). The amount of localized posterior depression was 75 μm as indicated by topography. Corneal thickness measured 450 μm within the lesion and 540 μm in the adjacent healthy cornea using the Orbscan system. The refractive power of both the posterior and anterior corneal curvature was 50 to 56 diopters within the paracentral area. Otherwise, both eyes were unremarkable. Following phacoemulsification and posterior chamber lens implantation visual acuity increased to 20/50 in the left eye. The examination of the fundus and vitreous revealed no pathological findings.

Bottom Line: This paper documents a rare nonprogressive developmental disorder-bilateral circumscribed posterior keratoconus-in a 60-year-old man referred for a cataract surgery.For the first time ultrasound biomicroscopy was used to visualise the local anterior bulging of the posterior corneal surface with concomitant thinning of the stroma.The amount of localized posterior depression, corneal thickness and the refractive power of both the posterior and anterior corneal curvature were measured using slit-scanning topography analysis (Orbscan).

View Article: PubMed Central - PubMed

Affiliation: Department of Ophthalmology, Medical University of Lublin, 20-059 Lublin, Poland.

ABSTRACT
This paper documents a rare nonprogressive developmental disorder-bilateral circumscribed posterior keratoconus-in a 60-year-old man referred for a cataract surgery. For the first time ultrasound biomicroscopy was used to visualise the local anterior bulging of the posterior corneal surface with concomitant thinning of the stroma. The amount of localized posterior depression, corneal thickness and the refractive power of both the posterior and anterior corneal curvature were measured using slit-scanning topography analysis (Orbscan).

No MeSH data available.


Related in: MedlinePlus