Mechanism of Tear Flow After Dacryocystorhinostomy and Jones' Tube Surgery

Nik, Narieman A.; Hurwitz, Jeffrey J.; Sang, Hongpeng

doi:10.1001/archopht.1984.01040031333020

Cited by 37 publications

(16 citation statements)

References 12 publications

(1 reference statement)

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“…Certainly in a facial palsy, tears will not be pumped through the lacrimal system. Even with a Jones tube in place, there will be a decrease in tear flow if the orbicularis muscle function is insufficient [10]. Fernandez-Valencia and Gomez Pellico [2] concluded that the saccus lacrimalis is subject to two muscular vectors that are activated during the contraction of the musculus orbicularis oculi.…”

Section: Discussionsupporting

confidence: 40%

“…Other authors suggest that physical factors such as gravity, respiration, absorption and evaporation might play a role in draining tears through the lacrimal system [5,6,8,10,15]. Brienen and Snell [1] postulated that the main, and presumably the sole, force that impels lacrimal flow from the conjunctival sac is the pressure brought about by closing of the eyes.…”

Section: Discussioncontrasting

confidence: 40%

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Functional anatomy of the human efferent tear ducts: a new theory of tear outflow mechanism

Thale

Paulsen

Rochels

et al. 1998

Graefe's Arch Clin Exp Ophthalmol

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Section: Discussionsupporting

confidence: 40%

Section: Discussioncontrasting

confidence: 40%

Functional anatomy of the human efferent tear ducts: a new theory of tear outflow mechanism

Thale

Paulsen

Rochels

et al. 1998

Graefe's Arch Clin Exp Ophthalmol

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“…Quantitative analysis is useful as the lacrimal sac and nose are transformed into one compartment following DCR however anatomical correlation can still be difficult ( Figure 2). Nik et al 35 reported a faster flow of tears into the nose following DCR when compared to normal individuals in a study involving 42 patients. Contrary to this, Zilelioglu et al 36 reported a slower tear flow in the eye that underwent external or endoscopic DCR, when compared to the unoperated fellow asymptomatic eye.…”

Section: Ls After Dcrmentioning

confidence: 47%

Lacrimal Scintigraphy: “Interpretation More Art than Science”

Sagili¹,

Selva²,

Malhotra³

2012

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Lacrimal scintigraphy (LS) or dacryoscintigraphy can demonstrate abnormalities in 80%-95% of patients with symptoms of epiphora and a patent lacrimal system on syringing and up to 40% asymptomatic individuals. Precise localization of the site of delay may not always be possible due to lack of anatomic detail on LS. LS is considered useful in patients with epiphora with delayed tear clearance and patency to syringing and suspected to have either nasolacrimal duct (NLD) stenosis or lacrimal pump failure. It remains unclear, however, as to whether LS can reliably distinguish between the two. The literature reports considerable variation in the technique, normative data, analysis, and interpretation of LS. Qualitative or visual analysis is simpler to perform and to our knowledge used more frequently in comparison to quantitative analysis. There is little extra information to be gained from LS in cases with complete NLD obstruction or severe NLD stenosis on syringing.

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“…6 The tube's mechanism for tear drainage is to provide a capillary action into the ostium for draining tears from the palpebral aperture into the nose. 7 For better tear drainage, the ideal tube should be straight rather than curved, hydrophobic, with some rigidity, and with a low tissue reaction. 17 Because the material of the tube plays an important role, we used a Pyrex glass tube (Jones tube).…”

Section: Discussionmentioning

confidence: 41%

“…6 However, the surgeon usually has to manage these patients with DCR and insertion of a bypass tube. 2,4,7 In external DCR, an ophthalmologist encounters such difficulties as wound bleeding and facial scarring, and the requirement of high surgical technique and expertise. 1,2,17 Endonasal DCR has the disadvantages of prolonged operative time, requirement of an endoscopic or laser instrument, bone removal, and a low success rate.…”

Section: Discussionmentioning

confidence: 49%