scholarly journals A relationship between tube length and intra-ocular pressure after glaucoma drainage implant surgery cannot be explained by Poiseuille's law - author's reply

2013 ◽  
Vol 92 (2) ◽  
pp. e157-e157 ◽  
Author(s):  
Kyoung In Jung ◽  
Hae-Young L. Park ◽  
Chan Kee Park
Keyword(s):  
Tube Length ◽  
Implant Surgery ◽  
Intra Ocular Pressure ◽  
Poiseuille's Law ◽  
Ocular Pressure ◽  
Poiseuille’S Law

scholarly journals Effect of trabeculectomy and canaloplasty on intra-ocular pressure modifications after postural changes in open-angle glaucoma

2014 ◽  
Vol 92 (6) ◽  
pp. e498-e499 ◽  
Author(s):  
Luciano Quaranta ◽  
Elena Biagioli ◽  
Ivano Riva ◽  
Claudia Tosoni ◽  
Paolo Brusini ◽  
...  
Keyword(s):  
Open Angle Glaucoma ◽  
Open Angle ◽  
Intra Ocular Pressure ◽  
Postural Changes ◽  
Ocular Pressure

Intra-ocular pressure changes during maximal isometric contraction: Does this reflect intra-cranial pressure or retinal venous pressure?

1999 ◽  
Vol 21 (3) ◽  
pp. 243-246 ◽  
Author(s):  
Rob D. Dickerman ◽  
Greg H. Smith ◽  
Len Langham-Roof ◽  
Walter J. McConathy ◽  
John W. East ◽  
...  
Keyword(s):  
Isometric Contraction ◽  
Venous Pressure ◽  
Retinal Venous Pressure ◽  
Intra Ocular Pressure ◽  
Ocular Pressure ◽  
Pressure Changes ◽  
Intra Cranial Pressure

Telemedicine in the control of intra-ocular pressure

2000 ◽  
Vol 6 (1_suppl) ◽  
pp. 126-128 ◽  
Author(s):  
G Michelson ◽  
W Striebel ◽  
W Prihoda ◽  
Volker Schmidt
Keyword(s):  
Cost Effective ◽  
Western World ◽  
Pressure Curve ◽  
Effective Technique ◽  
Intra Ocular Pressure ◽  
Continuous Evaluation ◽  
Common Causes ◽  
Cost Effective Technique ◽  
Email Message ◽  
Ocular Pressure

Glaucoma is one of the most common causes of blindness in the Western world and a major risk factor is increased intra-ocular pressure. We therefore used telemedicine in its control. Patients measured their intra-ocular pressure several times a day with a portable instrument and the values were then entered into a portable digital assistant. These data were transmitted by a modem to a central server. If the intra-ocular pressure was pathologically high, an email message was automatically sent to the ophthalmologist. The pressure curve, including a statistical analysis, was displayed in an easily readable chart format. Ten patients with glaucoma participated in a trial. Self-tonometry with telemedicine enabled continuous evaluation of the patient by the ophthalmologist. This approach offered the advantage of controlling the treatment remotely. Advantages for the patient were that the measurements were easily done at home under normal conditions, and the patient could control when the measurement and data transmission would be performed. Telemedicine is a cost-effective technique enabling the early diagnosis of pathologically increased intra-ocular pressure.

Oral drugs for glaucoma

1965 ◽  
Vol 3 (25) ◽  
pp. 99-100
Keyword(s):  
Carbonic Anhydrase ◽  
Anterior Chamber ◽  
Peripheral Vision ◽  
Oral Drugs ◽  
Carbonic Anhydrase Inhibitors ◽  
Intra Ocular Pressure ◽  
Ocular Pressure ◽  
Minor Operations ◽  
Closed Angle ◽  
Short Time

To prevent loss of peripheral vision in chronic glaucoma uninterrupted control of intra-ocular pressure is important, and we have discussed the use of local applications for this.1 A carbonic anhydrase inhibitor given by mouth may be a useful adjunct to treatment when intra-ocular pressure cannot be controlled by local applications alone or by operations such as cutting a drainage channel from the anterior chamber to the subconjunctival tissue. Carbonic anhydrase inhibitors may also usefully reduce tension for a short time in acute closed angle glaucoma (where the drainage angle of the anterior chamber is blocked), in acute glaucoma due to uveitis (the commonest cause of secondary glaucoma) and before operations for glaucoma. Their use is dangerous if they mask symptoms and so delay surgery; and thus for eye conditions carbonic anhydrase inhibitors are best given only on the advice of an ophthalmologist. The value of certain minor operations (e.g. trabeculotomy) which may increase the responsiveness of the eye to drugs is being investigated.

scholarly journals The contraction of the extrinsic muscles of the eye by choline and nicotine

1930 ◽  
Vol 107 (751) ◽  
pp. 332-343 ◽  
Keyword(s):  
General Circulation ◽  
General Rule ◽  
Significant Feature ◽  
Base Line ◽  
Similar Reaction ◽  
Vascular Events ◽  
Intra Ocular Pressure ◽  
Motor Nerves ◽  
Ocular Pressure ◽  
Extrinsic Muscles

It has long been known that choline, acetylcholine (Reisser, 1921), and nicotine (Langley, 1906-14) contract the normal striped muscle of Sauropsidæ (frog, fowl, etc.), and it has been recently demonstrated that a similar reaction occurs in the fœtal muscle of mammals (Rückert, 1930), but hitherto it has never been shown to occur in the muscles of the fully-developed mammalian. It has also been well established that the voluntary muscles of mammals, after degeneration of the motor nerves, exhibit a "pseudo-motor" contraction on the injection of choline. (Frank, Northmann and Hirsch-Kauffmann, 1922-23), a contraction which appears analogous in origin and in nature to that first described in the tongue by Vulpian and Phillipeaux (1863), and in the muscles of the limbs by Sherrington (1894), which occurs on stimulation of the sensory roots after the motor roots have degenerated. Recent writers in discussing the theoretical basis of these phenomena have stressed the point that this type of contraction occurs in mammals only after degeneration of the motor nerves, and have based some of their conclusions upon this assumption. The following experiments show, however, that this statement is no universally true, and that the extrinsic muscles of the eye form an exception to the general rule. The matter arose as a side-issue during an extended research on the mechanism controlling the intra-ocular pressure, when anomalous changes were noted while investigating the effect of choline and acetylcholine upon the pressure in the eye. These experiments are recorded in a separate publication (Duke-Elder, 1930): it is sufficient for the present purpose to say that in experiments upon anæthetised dogs, while small doses of choline such as produce a depressor effect when injected intra-venously (0·2 c. c. of a 1 in 20 solution) give rise to a fall in the intra-ocular pressure of the order which would be expected from the events in the vascular circulation, larger doses, on the other hand, lead to an increase in the intra-ocular pressure much larger than could be explained by any vascular events. In order, therefore, to reduce the number of variables with which we were dealing, the technique was extended to the perfusion of the eye with an artificial circulation, whereby the conditions in the general circulation were kept constant (Duke-Elder, 1930); and fig. 1 shows that in these circumstances, even when we would have expected a fall in the intra-ocular pressure owing to a local vasoconstriction when the pressor component of choline was elicited, a rise was obtained. The most significant feature was that this rise was accompanied by a movement of the base-line in the tracing registered by the optical manometer denoting a movement of the eye in the direction of enophthalmos.

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