Comparing Immersion Ultrasound With Partial Coherence Interferometry for Intraocular Lens Power Calculation

Narváez, Julio; Cherwek, David Hunter; Stulting, R. Doyle; Waldron, Rhonda; Zimmerman, Grenith; Wessels, Izak F; Waring, George O.

doi:10.3928/15428877-20080101-08

Cited by 34 publications

(30 citation statements)

References 21 publications

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“…These data showed the relatively low contribution of error from the axial length source, while the achievement of 0.01 ± 0.20 D error in spectacle plane in 95% of observations has not yet been reached. The reported number of predictions that fall within ±0.5 D, ± 1.0 D, ± 2.0 D of the expected outcome were reached in 55.6-69% [14,20,21]; 87-95.7% [14,20,21,23] and 99.9-100% [20,21] of cases obtained with PCLI biometry. When two methods were compared by Bland-Altman analysis, they demonstrated acceptable agreement for clinical purposes.…”

Section: Discussionmentioning

confidence: 82%

“…This would be acceptable for clinical purposes, according to the reported number of predictions that fall within ±0.5 D, ± 1.0 D, ± 2.0 D of the expected outcome in 45.5-92% [14,15,20,21]; 77.3-93.5% [14,[20][21][22][23] and 98.4-100% [20][21][22] of cases obtained with ultrasound biometry, respectively.…”

Section: Discussionmentioning

confidence: 96%

“…Method-comparison studies of immersion [14,15] and contact [4,16] ultrasound give the correlation coefficient (r) between the results of two measurement methods as an indicator of agreement. It has been evidenced that a high correlation coefficient does not mean that the two methods agree, since r measures strength of a relation between two variables, and not agreement between them [13].…”

Section: Discussionmentioning

confidence: 99%

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Comparison of optical low-coherence reflectometry and applanation ultrasound biometry on intraocular lens power calculation

Rončević¹,

Bušić²,

Čima³

et al. 2010

Graefes Arch Clin Exp Ophthalmol

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Based on excellent repeatability of the Lenstar and acceptable repeatability of applanation ultrasound, two techniques may be used interchangeably. The predicted refractive error of ± 0.20 D in 95% of the observations has never been achieved. Optical low-coherence reflectometry might become a new standard method for biometric measurement needed for intraocular lens-power calculation in patients with cataract.

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Section: Discussionmentioning

confidence: 82%

Section: Discussionmentioning

confidence: 96%

Section: Discussionmentioning

confidence: 99%

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Comparison of optical low-coherence reflectometry and applanation ultrasound biometry on intraocular lens power calculation

Rončević¹,

Bušić²,

Čima³

et al. 2010

Graefes Arch Clin Exp Ophthalmol

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“…These data are impressive, because achievement of about 95% of eyes within±0.50 D of the targeted refraction would be an excellent refractive outcome. Reported number of predictions within ±0.5 D, ±1.0 D and ± 2.0 D of the expected outcome was 55.6%-92% [15][16][17][18], 87%-95.7% [15,[17][18][19], and 99.9%-100% [15,18] of cases with PCLI, compared to 45.5%-69.6% [15,17,18], 77.3%-93.5% [15,[17][18][19][20], and 98.4%-100% [15,18,20] of cases with ultrasound respectively.…”

Section: Discussionmentioning

confidence: 99%

Intraobserver and interobserver repeatability of ocular components measurement in cataract eyes using a new optical low coherence reflectometer

Rončević¹,

Bušić²,

Čima³

et al. 2010

Graefes Arch Clin Exp Ophthalmol

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“…[1][2][3][4] The new composite IOLMaster version 5 software has demonstrated a failure rate of 7.4%, primarily because of posterior subcapsular cataracts. 5 Few studies of the efficacy of PCI in a teaching hospital setting have been done.…”

Section: Partial Coherence Interferometry In a Teaching Hospitalmentioning

confidence: 99%

Partial coherence interferometry in a teaching hospital

Wei¹,

Katsoulakis²,

Filippopoulos³

et al. 2009

Journal of Cataract and Refractive Surgery

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3. Shingleton BJ, Nguyen BKC, Eagan EF, Nagao K, O'Donoghue MW. Outcomes of phacoemulsification in fellow eyes of patients with unilateral pseudoexfoliation: single-surgeon series. J Cataract Refract Surg 2008; 34:274-279 4. Poley BJ, Lindstrom RL, Samuelson TW. Long-term effects of phacoemulsification with intraocular lens implantation in normotensive and ocular hypertensive eyes. J Cataract Refract Surg 2008; 34:735-742 5. Shingleton BJ, Gamell LS, O'Donoghue MW, Baylus SL, King R. Long-term changes in intraocular pressure after clear corneal phacoemulsification: normal patients versus glaucoma suspect and glaucoma patients. J Cataract Refract Surg 1999; 25:885-890 6. Merkur A, Damji KF, Mintsioulis G, Hodge WG. Intraocular pressure decrease after phacoemulsification in patients with pseudoexfoliation syndrome.Partial coherence interferometry (PCI) has an 8% to 22% failure rate for a variety of reasons such as mature cataract, inability to fixate secondary to macular degeneration, tremor, keratopathy, nystagmus, and vitreous hemorrhage. 1-4 The new composite IOLMaster version 5 software has demonstrated a failure rate of 7.4%, primarily because of posterior subcapsular cataracts. 5 Few studies of the efficacy of PCI in a teaching hospital setting have been done. We investigated the PCI failure rate with the IOLMaster (Carl Zeiss Meditec) in a resident ophthalmology clinic at a Veterans Affairs hospital.After investigative review board approval was obtained, the biometric measurements of 147 consecutive patients (165 eyes) who had resident-performed cataract surgery from September 2007 to June 2008 were examined. Thirty-nine patients (42 eyes) were excluded because of incomplete electronic medical records (EMRs). One hundred eight patients (123 eyes) met the inclusion criteria; 106 were men (98.1%). The mean age of the patients was 72.4 years (range 50 to 91 years). Forty-six eyes (37.4%) were documented PCI failures that required immersion A-scan for axial length determination. The subgroup of 88 eyes that had IOLMaster version 4 readings had a failure rate of 43.2%, whereas the subgroup of 35 eyes with IOLMaster version 5 readings had a significantly lower failure rate of 22.9% (odds ratio Z 0.38, P!.05). All PCI failures were due to dense cataract. The mean preoperative best corrected visual acuity (BCVA) was 20/60 in those who had successful PCI compared with !20/400 in those requiring immersion A-scan (P Z.01).The limitations of this study include the retrospective nature, variability in measurements secondary to different resident physicians performing PCI, small sample size, a large number of exclusions due to incomplete EMRs, and inability to analyze the PCI failures by type of cataract because of variable grading of cataracts.The study suggests that the PCI biometry failure rate is still significant in the veteran population due to dense cataracts, although the version 5 software appears to decrease this rate. The study also suggests that poor preoperative vision is a predictor of PCI failure. We look f...

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Comparing Immersion Ultrasound With Partial Coherence Interferometry for Intraocular Lens Power Calculation

Abstract: When it can be used, interferometry is equivalent to immersion ultrasonography regarding biometric accuracy and precision. However, it cannot replace ultrasonography, especially for eyes with dense media opacity.

Cited by 34 publications

References 21 publications

Comparison of optical low-coherence reflectometry and applanation ultrasound biometry on intraocular lens power calculation

Comparison of optical low-coherence reflectometry and applanation ultrasound biometry on intraocular lens power calculation

Intraobserver and interobserver repeatability of ocular components measurement in cataract eyes using a new optical low coherence reflectometer

Partial coherence interferometry in a teaching hospital

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