Blumenthal EZ.

Med Hypotheses. 1991 Dec;36(4):381-3.

ABSTRACT:

This hypothesized reflex relates the vertical direction of gaze to the amount of tension exerted by the ciliary muscle. Based on simple observations the following is assumed. When looking downwards a tendency for closer focusing (near searching) exists even without a specific visual stimulus, whereas looking up favors a more relaxed state of the accommodative mechanism. This reflex is much weaker than accommodation induced by visual stimuli but may have potential practical implications with regards to automated objective ocular refraction devices. When using such instruments it is crucial to eliminate entirely all accommodation. The inability to achieve such relaxation has prevented automated devices from completely replacing all manual and subjective techniques in ophthalmology practice. If the reflex is empirically proven to exist, then by performing objective examinations while the patient’s gaze is directed up, more precise measurements may be achieved. An additional benefit can be derived from comparing upward versus forward gaze measurements. Even a small difference can imply that accommodation has been triggered, so that ultimately this screening method enables identification of the accommodators sub-group and reciprocally approving the accuracy of the non-accommodators sub-group results.

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גלאוקומה וקטרקט:
www.glaucoma.org.il

ניתוח

אבחנה

אתר זה נכתב ע”י פרופ’ איתן בלומנטל. באתר תמצאו אינפורמציה מעמיקה על האבחון והטיפול בגלאוקומה ובקטרקט. האינפורמציה באתר איננה תחליף לייעוץ רפואי.

פוסט קשור

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Risk Factors and Incidence of Ocular Hypertension After Penetrating Keratoplasty
Faik Oruc¸oglu, MD, Eytan Z. Blumenthal, MD, Joseph Frucht-Pery, MD, and Abraham Solomon, MD Journal of Glaucoma. 2013 Feb 19. Kudret Eye Hospital, Istanbul, Turkey Department of Ophthalmology, Hadassah-Hebrew...
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רשימת פרסומים מדעיים של פרופ' איתן בלומנטל
ORIGINAL RESEARCH PAPERS Blumenthal EZ. Adjusting the slit-lamp oculars: An unnecessary burden or a must?  Survey of Ophthalmology 1995;40(3):225-228. Abstract Full-text (PDF) Blumenthal EZ, Serpetopoulos...
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Adjusting The Slit-Lamp Oculars: An Unnecessary Burden Or A Must?
Blumenthal EZ. Surv Ophthalmol. 1995 Nov-Dec;40(3):225-8. Department of Opthalmology, Hadassah University Hospital, Jerusalem, Israel. ABSTRACT: Adjusting the slit-lamp eyepiece rings is perceived by some...
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On Focusing The Slit-Lamp: Part I. An Inaccurate Ocular Setting–What Is There To Lose?
Blumenthal EZ, Serpetopoulos CN. Surv Ophthalmol. 1998 Jan-Feb;42(4):351-4. Department of Ophthalmology, Hadassah University Hospital, Jerusalem, Israel. ABSTRACT: Adjustments of the diopter rings on the...
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Glaucomatous-Like Cupping Associated With Slow-Growing Supra-Sellar Intracranial Lesions
Blumenthal EZ, Girkin CA, Dotan S. Neuro-Ophthalmology. 2006;30:111-115. Department of Ophthalmology, Hebrew University-Hadassah Medical Center, Jerusalem, Israel. eblumenthal@md.huji.ac.il ABSTRACT: PURPOSE:...