Repeated Applanation Tonometry

Moses, Robert A.

doi:10.1159/000304168

Cited by 69 publications

(42 citation statements)

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“…Conversely, a thinner cornea results in underestimation of IOP, because of the ease of applanating. Increased corneal thickness due to edema, however, may lead to underestimation of the IOP [57,[61][62][63][64][65][66]. The IOP measurement of failing grafts may be falsely low due to corneal edema ( Fig.…”

Section: Pachymetrymentioning

confidence: 99%

Graft failure: III. Glaucoma escalation after penetrating keratoplasty

Greenlee

Kwon

2008

Int Ophthalmol

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Glaucoma after penetrating keratoplasty is a frequently observed post-operative complication and is a risk factor for graft failure. Penetrating keratoplasty performed for aphakic and pseudophakic bullous keratopathy and inflammatory conditions are more likely to cause postoperative glaucoma compared with keratoconus and Fuchs' endothelial dystrophy. The intraocular pressure elevation may occur immediately after surgery or in the early to late postoperative period. Early postoperative causes of glaucoma include pre-existing glaucoma, retained viscoelastic, hyphema, inflammation, pupillary block, aqueous misdirection, or suprachoroidal hemorrhage. Late causes include pre-existing glaucoma, angle-closure glaucoma, ghost cell glaucoma, suprachoroidal hemorrhage, and steroid-induced glaucoma. Determining the cause of IOP elevation can help guide therapeutic intervention. Treatments for refractory glaucoma include topical anti-glaucoma medications such as beta-adrenergic blockers. Topical carbonic anhydrase inhibitors, miotic agents, adrenergic agonists, and prostaglandin analogs should be used with caution in the post-keratoplasty patient, because of the possibility of corneal decompensation, cystoid macular edema, or persistent inflammation. Various glaucoma surgical treatments have reported success in post-keratoplasty glaucoma. Trabeculectomy with mitomycin C can be successful in controlling IOP without the corneal toxicity noted with 5-fluorouracil. Glaucoma drainage devices have successfully controlled intraocular pressure in postkeratoplasty glaucoma; this is, however, associated with increased risk of graft failure. Placement of the tube through the pars plana may improve graft success compared with implantation within the anterior chamber. In addition, cyclophotocoagulation remains a useful procedure for eyes that have refractory glaucoma despite multiple surgical interventions.

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Section: Pachymetrymentioning

confidence: 99%

Graft failure: III. Glaucoma escalation after penetrating keratoplasty

Greenlee

Kwon

2008

Int Ophthalmol

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“…They have all been compared with the Goldmann applanation tonometer, which has been considered the current standard method [7,25,26]. When comparing tonometry devices, sequence randomization of measurement methods is necessary because each previous measurement lowers the IOP by 0.1-0.4 mmHg [13,14]. Therefore, this study sought to randomize the application sequence of Goldmann and TGDc-01 assessment.…”

Section: Discussionmentioning

confidence: 99%

Deviations between transpalpebral tonometry using TGDc-01 and Goldmann applanation tonometry depending on the IOP level

Troost¹,

Specht²,

Krummenauer³

et al. 2005

Graefe's Arch Clin Exp Ophthalmol

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“…Even so, the clinical situation seems different, and there is evidence that other factors could possibly affect measurement of IOP, such as respiration [12], blinking [20], vertical eye movements [13], or accommodation on the part of the subjects [19].…”

Section: Discussionmentioning

confidence: 99%

Clinical comparison of two intraocular pressure measurement methods: SmartLens dynamic observing tonography versus Goldmann

Troost¹,

Vogel

Beck

et al. 2001

Graefe's Arch Clin Exp Ophthalmol

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Purpose: To compare intraocular pressure measurements obtained with SmartLens, a gonioscopic contact lens, to those from Goldmann applanation tonometry. Methods: Eighty volunteers (20 healthy individuals and 60 glaucoma patients from the university eye hospital's outpatient department) were examined using conventional Goldmann tonometry and the new SmartLens tool. For each device three replicate measurements were performed. A paired t-test and the corresponding mean difference confidence interval approach were used to assess deviations in location of the two tonometric methods; the test procedure of Maloney and Rastogi was used for comparison of precision in paired data. Intraindividual differences were evaluated according to the approach of Altman and Bland. Results: There was a mean difference of 5.6 mmHg (95% CI: 4.3 mmHg; 6.8 mmHg; P<0.01) in intraocular pressure between the two methods with a significant overestimation by SmartLens tonometry compared to Goldmann tonometry (P<0.01). The 95%-limits of agreement ranged from -5.4 mmHg to +16.6 mmHg for individual patients. The measurement method variance of SmartLens was higher (Maloney-Rastogi test; P <0.01). The mean coefficients of variation for intraindividual replicates were 10.1% (SmartLens) and 3.8% (Goldmann; P <0.01). Conclusions: Accepting Goldmann tonometry as gold standard for intraocular pressure measurement, the SmartLens method shows considerable variation and therefore is not proven to be an adequate substitute for Goldmann tonometry.

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Repeated Applanation Tonometry

Cited by 69 publications

References 0 publications

Graft failure: III. Glaucoma escalation after penetrating keratoplasty

Graft failure: III. Glaucoma escalation after penetrating keratoplasty

Deviations between transpalpebral tonometry using TGDc-01 and Goldmann applanation tonometry depending on the IOP level

Clinical comparison of two intraocular pressure measurement methods: SmartLens dynamic observing tonography versus Goldmann

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