e-book Non-Penetrating Glaucoma Surgery

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The surgeon will check your vision, IOP, and the appearance of the eye.


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At this point instructions regarding acceptable levels of activity and use of postoperative eye drops, including antibiotics, will be given. In general, strenuous activity, heavy lifting, and bending over should be avoided for the first few days. Unlike filtering surgeries, such as trabeculectomy and drainage devices, canaloplasty is not dependent upon conjunctival healing and the development of a filtering bleb for its success.

Therefore, excessive scar tissue leading to surgical failure is not typically a problem. Because the procedure does not enter the inside of the eye there is very little inflammation or swelling post-operatively, and almost zero risk of hypotony- intraocular pressure that is too low- as sometimes occurs with filtering surgery.

Vision is typically only mildly blurred, and discomfort is minimal. Post-operative eye drop use and physician check-ups are less frequent than after filtering surgery. Follow-up visits may be scheduled every one to two weeks. This same study also found that the average number of required glaucoma medications decreased from 1. This procedure is relatively new and good data is not yet available regarding long-term success rates.


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In some cases surgery fails to adequately control the IOP. Additional surgery may then be performed to reach the desired level of pressure within the eye. At such a point either a trabeculectomy or a drainage device procedure may be preferred see sections on Trabeculectomy or Glaucoma Drainage Devices. All surgical procedures carry some risk of complications. Some risks are common to all procedures and patients, and others are more specific to certain types of surgeries or to patients with particular conditions.

A thorough explanation of complications will be provided with a surgical consent, should you choose to have surgery, and your physician will review the specific issues you may face based upon your unique circumstances. As with most diseases, there are a number of treatment options for glaucoma.

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As previously noted, surgery is usually considered when medications and laser trabeculoplasty have failed to adequately control IOP. Canaloplasty is not the only option available. Other surgical procedures may be considered based upon the type of glaucoma, condition of the eye, and level of IOP required.

Some of these procedures are detailed in other sections of the library. Would you like to switch to the accessible version of this site?

Nonpenetrating Glaucoma Surgery vs. Trabeculectomy – Who is #1?

Go to accessible site Close modal window. Although when we looked at the outcome of partial success pressure controlled with additional eyedrops it was more imprecise and our results could not exclude one surgical approach being better than the other. However, the review noted that these studies had some limitations regarding their design and were too small to give definitive information on differences in complications following surgery.

None of the studies measured quality of life. This review provides some limited evidence that control of IOP is better with trabeculectomy than viscocanalostomy. For deep sclerectomy, we cannot draw any useful conclusions. This may reflect surgical difficulties in performing non-penetrating procedures and the need for surgical experience.

This review has highlighted the lack of use of quality of life outcomes and the need for higher methodological quality RCTs to address these issues.

Result Filters

Since it is unlikely that better IOP control will be offered by NPFS, but that these techniques offer potential gains for patients in terms of quality of life, we feel that such a trial is likely to be of a non-inferiority design with quality of life measures. Glaucoma is the second commonest cause of blindness worldwide. Non-penetrating glaucoma surgeries have been developed as a safer and more acceptable surgical intervention to patients compared to conventional procedures.

To compare the effectiveness of non-penetrating trabecular surgery compared with conventional trabeculectomy in people with glaucoma. We did not use any date or language restrictions in the electronic searches for trials.

Non-penetrating glaucoma surgery

We last searched the electronic databases on 27 September This review included relevant randomised controlled trials RCTs and quasi- RCTs on participants undergoing standard trabeculectomy for open-angle glaucoma compared to non-penetrating surgery, specifically viscocanalostomy or deep sclerectomy, with or without adjunctive measures. Two review authors independently reviewed the titles and abstracts of the search results.

We obtained full copies of all potentially eligible studies and assessed each one according to the definitions in the 'Criteria for considering studies' section of this review. We used standard methodological procedures expected by The Cochrane Collaboration. Drolsum L Conversion from trabeculectomy to deep sclerectomy. Prospective study of the first 44 cases.

Drolsum L Longterm follow-up after deep sclerectomy in patients with pseudoexfoliative glaucoma. Preliminary results. Krzywicki S, Szala E Non-perforating deep sclerectomy ab externo with intrascleral implant in juvenile glaucoma]. Ophthalmology — PubMed Google Scholar. Roy S, Mermoud A Complications of deep nonpenetrating sclerectomy. Anand N, Arora S, Clowes M Mitomycin C augmented glaucoma surgery: evolution of filtering bleb avascularity, transconjunctival oozing, and leaks. Risk of cataract formation after trabeculectomy.


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  6. Arch Ophthalmol — Google Scholar. Hyams M, Geyer O Iris prolapse at the surgical site: a late complication of nonpenetrating deep sclerectomy. Carassa RG, Bettin P, Fiori M, Brancato R Viscocanalostomy versus trabeculectomy in white adults affected by open-angle glaucoma: a 2-year randomized, controlled trial. Chiselita D Non-penetrating deep sclerectomy versus trabeculectomy in primary open-angle glaucoma surgery.

    The Current Situation in Non-penetrating Glaucoma Surgery

    Eye — PubMed Google Scholar. Personalised recommendations. Cite chapter How to cite? ENW EndNote.