Prospective Analysis of Changes in Corneal Topography After Upper Eyelid Surgery

Brown, Mark S.; Siegel, Irwin M.; Lisman, Richard D.

doi:10.1097/00002341-199911000-00002

Cited by 73 publications

(55 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Demographic data on refractive error show higher average levels of astigmatism in Asians compared with nonAsians, which could be due to the Asian eyelid having a narrower palpebral aperture, greater eyelid volume and thus higher eyelid tension. Eyelid morphology, including a narrower palpebral aperture, as well as conditions like ptosis, chalazion, or hemangioma, which increase the pressure of the eyelid exerted on the ocular surface, are known to be associated with astigmatic changes to the cornea [20,21,[23][24][25][26][27][28][29][30][31][32]. Although it has not to date been measured directly, it is plausible that anatomical features of the Asian eyelid result in greater eyelid pressure and therefore increased shear stress at the corneal surface.…”

Section: Discussionmentioning

confidence: 99%

Corneal epithelial permeability: Ethnic differences between Asians and non-Asians

Li¹,

Hsiao²,

Graham³

et al. 2013

Contact Lens and Anterior Eye

View full text Add to dashboard Cite

a b s t r a c tPurpose: To ascertain whether a difference in the permeability of the corneal epithelium to fluorescein (P dc ) exists between Asians and non-Asians. Methods: From a multi-study database we extracted 632 records of baseline, open-eye P dc measurements taken on both eyes of 176 subjects. Subjects were awake for a minimum of 4 h before measurement, and were free of ocular disease and central corneal staining. P dc was transformed by natural logarithm to better approximate normality for statistical tests. Results: The mean ln(P dc ) in the Asian group was significantly greater than in the non-Asian group [−2.34 ln(nm/s) vs. −2.58 ln(nm/s); p < 0.001]. Conclusions: Compared with non-Asians, Asians exhibited a less negative ln(P dc ), which translates to a higher P dc and a more permeable corneal epithelium. We speculate that this may be related to anatomic differences responsible for greater eyelid tension in Asians.

show abstract

Section: Discussionmentioning

confidence: 99%

Corneal epithelial permeability: Ethnic differences between Asians and non-Asians

Li¹,

Hsiao²,

Graham³

et al. 2013

Contact Lens and Anterior Eye

View full text Add to dashboard Cite

show abstract

“…[149][150][151] As some of these changes regressed with time after surgery, Holck, Dutton and Wearly 149 concluded that the astigmatic changes may be due to post-surgical eyelid swelling. Detorakis, Ioannakis and Kozobolis 151 investigated changes in corneal topography following lower eyelid surgery for involutional ectropian.…”

Section: Eyelid Pathology and Astigmatismmentioning

confidence: 99%

A review of astigmatism and its possible genesis

Read

Collins

Carney

2007

Clinical and Experimental Optometry

220

205

View full text Add to dashboard Cite

Astigmatism is a refractive condition encountered commonly in clinical practice. This review presents an overview of research that has been carried out examining various aspects of this refractive error. We examine the components of astigmatism and the research into the prevalence and natural course of astigmatic refractive errors throughout life. The prevalence of astigmatism in various ethnic groups and diseases and syndromes is also discussed. We highlight the extensive investigations that have been conducted into the possible aetiology of astigmatism, however, no single model or theory of the development of astigmatism has been proven conclusively. Theories of the development of astigmatism based on genetics, extraocular muscle tension, visual feedback and eyelid pressure are considered. Observations and evidence from the literature supporting and contradicting these hypotheses are presented. Recent advances in technology such as wavefront sensors and videokeratoscopes have led to an increased understanding of ocular astigmatism and with continued improvements in technology, our knowledge of astigmatism and its genesis should continue to grow.

show abstract

“…14,15 Upper eyelid swelling may act like a mass. Its removal led to increased with-the-rule astigmatism in a study of Brown et al 16 on patients without Graves' ophthalmopathy shortly after upper eyelid blepharoplasty. Yet, our study disclosed no astigmatic change in many of the Graves' eyes 6 months after upper eyelid blepharoplasty.…”

Section: Discussionmentioning

confidence: 98%

Corneal astigmatism in Graves' ophthalmopathy

Mombaerts¹,

Vandelanotte²,

Koornneef³

2005

Eye

View full text Add to dashboard Cite

Purpose To describe corneal astigmatism in patients under the age of 55 years with Graves' ophthalmopathy and to compare it to a control group. Methods Retrospective, nonrandomized comparative observational case series. A total of 109 patients with inactive Graves' ophthalmopathy and 109 ageand gender-matched control individuals without Graves' ophthalmopathy were examined with manual corneal keratometry. In the Graves' patients, 52% had a CT scan available for review, and 41% underwent orbital, strabismus, and/or eyelid surgery with a follow-up of keratometry over a mean period of 1.7 years after surgery. Results For the dioptres, there was a statistically significant difference between the Graves' and the control eyes at 3-3.25 dioptres in both eyes (t-test, right eyes, P ¼ 0.042; left eyes, P ¼ 0.041). For the meridians, the astigmatism was found to be greater at the meridians 95-1001 (t-test, P ¼ 0.044) and 1051-1101 (t-test, P ¼ 0.017) in the right eyes only. In 10 (9%) Graves' patients, the astigmatism had caused newly acquired reduced visual acuity. Greater astigmatism in dioptres did not correlate with specific CT scan findings (v 2 -test, df ¼ 2, P ¼ 0.187). Following orbital, strabismus, and eyelid surgery, the dioptres and meridians of the astigmatism did not change in 56 (68%) and 66 (81%) eyes, respectively. Conclusion Graves' ophthalmopathy may be associated with greater with-the-rule corneal astigmatism, which, overall, is not influenced by orbital, strabismus, or eyelid surgery. The astigmatism may possibly be caused by softtissue fibrosis in the superolateral orbital region.

show abstract

Prospective Analysis of Changes in Corneal Topography After Upper Eyelid Surgery

Cited by 73 publications

References 0 publications

Corneal epithelial permeability: Ethnic differences between Asians and non-Asians

Corneal epithelial permeability: Ethnic differences between Asians and non-Asians

A review of astigmatism and its possible genesis

Corneal astigmatism in Graves' ophthalmopathy

Contact Info

Product

Resources

About