ISSN:1040-5488    

出版商:OVID    

年代:1998

数据来源: OVID

ISSN:1040-5488    

出版商:OVID    

年代:1998

数据来源: OVID

ISSN:1040-5488    

出版商:OVID    

年代:1998

数据来源: OVID

ISSN:1040-5488    

出版商:OVID    

年代:1998

数据来源: OVID

ISSN:1040-5488    

出版商:OVID    

年代:1998

数据来源: OVID

ISSN:1040-5488    

出版商:OVID    

年代:1998

数据来源: OVID

ISSN:1040-5488    

出版商:OVID    

年代:1998

数据来源: OVID

摘要:

Anterior segment dysgenesis is characterized by a spectrum of congenital anomalies involving the cornea, the iris, and the anterior chamber angle; it may be further complicated by systemic anomalies and glaucoma. Peters' anomaly, a specific type of mesenchymal anterior segment dysgenesis, is characterized by a central corneal leukoma, iridocorneal adhesions, and abnormalities of the posterior corneal stroma, Descemet's membrane, corneal endothelium, lens, and anterior chamber. Eighty percent of the cases are bilateral. We present an unusual unilateral case of Peters' anomaly complicated by postsurgical ocular muscle deviation, an iatrogenic corneal tattoo, cataract, and papillary conjunctivitis associated with contact lens wear. This article illustrates the classification of variants of anterior segment dysgenesis and the technique of corneal tatooing, as well as the use of prosthetic contact lenses in the management of corneal opacities. We stress that successful management of Peters' anomaly requires proper diagnosis of the condition, age-appropriate treatment with surgical consultation, and careful follow-up in affected patients.

ISSN:1040-5488    

出版商:OVID    

年代:1998

数据来源: OVID

摘要:

Background.The absolute accuracy of videokeratoscope (VKS) mapping of keratoconus is still in question, with contact lens-induced corneal warpage and chalazion having been shown to resemble this condition closely. Corneal thinning is investigated as a further aid to the diagnosis and description of keratoconus.Methods.The diagnosis of keratoconus in 41 individuals was verified by measuring the corneal thickness difference (I-S difference) between two disparate corneal locations, one inferior to (I) and one superior to (S) the corneal apex, using a Humphrey model 870 Ultrasound pachometer. Corresponding measures of I-S radii were made using radius values obtained from the EyeSys VKS.Results.A comparison between I-S pachometry and I-S radius demonstrated a marginally increased sensitivity for the latter measurement. Using 95% confidence levels from normative pachometric data, classification of severity of keratoconus is proposed as follows: (1) keratoconus suspect/early keratoconus: I-S pachometry 75 to 100 μm; (2) moderate keratoconus: 100 to 125 μm; and (3) advanced keratoconus: >125 μm.Conclusion.I-S pachometry can be used as a descriptor of keratoconus.

ISSN:1040-5488    

出版商:OVID    

年代:1998

数据来源: OVID

摘要:

Purpose. To compare the agreement and repeatability of keratometry measurements with simulated keratometry measurements from the EyeSys (model II) corneal analysis system (CAS). Furthermore, to establish any relationship between the repeatability of peripheral corneal measurements and the spatial location at the cornea. Methods. Measurements using a Bausch & Lomb keratometer in 19 eyes (19 subjects) were compared with the simulated keratometry values using the EyeSys CAS. Repeatability of the keratometer (14 eyes, 14 subjects) and the EyeSys simulated keratometry values (10 eyes, 10 subjects) was assessed by comparing the difference of two measurements. Peripheral repeatability of the EyeSys CAS was compared in a similar manner in a sample of 10 eyes (10 subjects). Results. The 95% confidence limits (—0.529 to +0.149 D) showed a lack of agreement between both instruments. With respect to the repeatability, both the keratometer (SD=±0.103 D) and the EyeSys (SD=±0.072 D) were found to exhibit approximately similar degrees of repeatability. The repeatability of peripheral corneal measurements using the EyeSys CAS showed changes in repeatability dependent on the corneal meridian and the distance from the point of alignment. Measurements along the superior and nasal meridians showed poorest repeatability. Repeatability was also found to deteriorate away from the point of alignment. Conclusions. EyeSys simulated keratometry values were not interchangeable with the keratometer. This could be due to differences in the method of alignment or measurements from different areas on the corneal surface. Repeatability of both the Bausch & Lomb keratometer and the EyeSys CAS was found to be similar. The spatial dependency of peripheral corneal radius repeatability measurements could be attributed to interference of the ocular adnexa in those areas of measurement.

ISSN:1040-5488    

出版商:OVID    

年代:1998

数据来源: OVID