| Ocular blood flow measurements in healthy human myopic eyes. | |
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MedLine Citation:
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PMID: 20502909 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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BACKGROUND: To evaluate the haemodynamic features of young healthy myopes and emmetropes, in order to ascertain the perfusion profile of human myopia and its relationship with axial length prior to reaching a degenerative state. METHODS: The retrobulbar, microretinal and pulsatile ocular blood flow (POBF) of one eye of each of twenty-two high myopes (N = 22, mean spherical equivalent (MSE) ≤-5.00D), low myopes (N = 22, MSE-1.00 to-4.50D) and emmetropes (N = 22, MSE ± 0.50D) was analyzed using color Doppler Imaging, Heidelberg retinal flowmetry and ocular blood flow analyser (OBF) respectively. Intraocular pressure, axial length (AL), systemic blood pressure, and body mass index were measured. RESULTS: When compared to the emmetropes and low myopes, the AL was greater in high myopia (p < 0.0001). High myopes showed higher central retinal artery resistance index (CRA RI) (p = 0.004), higher peak systolic to end diastolic velocities ratio (CRA ratio) and lower end diastolic velocity (CRA EDv) compared to low myopes (p = 0.014, p = 0.037). Compared to emmetropes, high myopes showed lower OBFamplitude (OBFa) (p = 0.016). The POBF correlated significantly with the systolic and diastolic blood velocities of the CRA (p = 0.016, p = 0.036). MSE and AL correlated negatively with OBFa (p = 0.03, p = 0.003), OBF volume (p = 0.02, p < 0.001), POBF (p = 0.01, p < 0.001) and positively with CRA RI (p = 0.007, p = 0.05). CONCLUSION: High myopes exhibited significantly reduced pulse amplitude and CRA blood velocity, the first of which may be due to an OBF measurement artefact or real decreased ocular blood flow pulsatility. Axial length and refractive error correlated moderately with the ocular pulse and with the resistance index of the CRA, which in turn correlated amongst themselves. It is hypothesized that the compromised pulsatile and CRA haemodynamics observed in young healthy myopes is an early feature of the decrease in ocular blood flow reported in pathological myopia. Such vascular features would increase the susceptibility for vascular and age-related eye diseases. |
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Authors:
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Alexandra Benavente-Pérez; Sarah L Hosking; Nicola S Logan; David C Broadway |
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Publication Detail:
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Type: Controlled Clinical Trial; Journal Article Date: 2010-05-26 |
Journal Detail:
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Title: Graefe's archive for clinical and experimental ophthalmology = Albrecht von Graefes Archiv für klinische und experimentelle Ophthalmologie Volume: 248 ISSN: 1435-702X ISO Abbreviation: Graefes Arch. Clin. Exp. Ophthalmol. Publication Date: 2010 Nov |
Date Detail:
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Created Date: 2010-09-24 Completed Date: 2010-12-22 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 8205248 Medline TA: Graefes Arch Clin Exp Ophthalmol Country: Germany |
Other Details:
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Languages: eng Pagination: 1587-94 Citation Subset: IM |
Affiliation:
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Department of Biological Sciences, SUNY College of Optometry, 33 West 42nd Street, New York 10036, USA. abenavente@sunyopt.edu |
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| MeSH Terms | |
Descriptor/Qualifier:
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Biometry Blood Flow Velocity / physiology Blood Pressure / physiology Body Mass Index Ciliary Arteries / physiology* Emmetropia / physiology* Female Humans Intraocular Pressure / physiology Male Myopia / physiopathology* Ophthalmic Artery / physiology* Pulsatile Flow Regional Blood Flow / physiology Retinal Artery / physiology* Ultrasonography, Doppler, Color Young Adult |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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