The Influence of Induced Astigmatism on the Depth of Focus

Leube, Alexander; Ohlendorf, Arne; Wahl, Siegfried

doi:10.1097/opx.0000000000000961

Cited by 20 publications

(24 citation statements)

References 36 publications

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“…Although this is usually poorly tolerated postoperatively, the pinhole effect of the IC-8 may allow for refractive error to be compensated for, and may in fact help to enhance depth of focus as induced astigmatism has previously been reported to help enhance depth of focus for near vision. 19 The patient who received the AT Lisa IOLs (i.e., Case 4) presented postoperatively with fluctuating refraction, a common postoperative complication of RK, and postoperative myopia in both eyes; mean SE decreased from 1.875 D preoperatively to −1.75 D postoperatively. This overcorrection could be due to preoperative instability of the cornea and fluctuations in preoperative or postoperative refraction.…”

Section: Discussionmentioning

confidence: 99%

<p>Spectacle Independence in Patients with Prior Radial Keratotomy Following Cataract Surgery: A Case Series</p>

Agarwal¹,

Thornell²

2020

IMCRJ

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Purpose: To assess if post-keratorefractive patients can achieve spectacle independence following cataract surgery with currently available presbyopia correcting intraocular lenses (IOLs). Patients and Methods: Retrospective case series of unilateral implantation of the IC-8 IOL in two patients with history of bilateral myopic radial keratotomy (RK) and one patient with history of bilateral myopic RK and astigmatic keratotomy (AK), and bilateral implantation of AT Lisa 939M multifocal IOLs in one patient with previous history of RK and laser in situ keratomileusis (LASIK). Results: Good uncorrected distance, intermediate and near visual acuity (VA) was achieved for most patients. Stereopsis and contrast sensitivity (CS) were maintained in patients that received the IC-8 IOLs, and two patients achieved full spectacle independence. The patient that received the trifocal lenses expressed satisfaction with their vision, but required long distance correction and experienced reduced CS. Conclusion: The IC-8 and AT Lisa 939M IOLs both offer satisfactory results and reduced spectacle dependence in post-keratorefractive patients. However, it is recommended to properly counsel visual outcomes and patient expectations before commencing surgery.

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Section: Discussionmentioning

confidence: 99%

<p>Spectacle Independence in Patients with Prior Radial Keratotomy Following Cataract Surgery: A Case Series</p>

Agarwal¹,

Thornell²

2020

IMCRJ

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“…Leube et al 22 reported that residual astigmatism could affect the subjective depth of focus. He concluded that with an induced WTR astigmatism of −0.5 D, the depth of focus could be enhanced in the near viewing distance with a marginal loss in binocular visual acuity (VA).…”

Section: Discussionmentioning

confidence: 99%

Comparing surgically induced astigmatism calculated by means of simulated keratometry versus total corneal refractive power

Garzón

Rodríguez‐Vallejo²,

Carmona

et al. 2018

European Journal of Ophthalmology

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“…Participants wore their distance correction in a trial frame (UB4, Oculus, Germany) corrected for a viewing distance of 5 m. To evaluate the subjective depth of focus, defocus curves of high contrast visual acuity in a dioptric range of ± 1.50 D within 0.5 D steps were measured. The method to calculate the depth of focus from subjective obtained defocus curve was described elsewhere 37 . In brief, DoF is defined as the horizontal dioptric range at the threshold level of + 0.1 logMAR below the maximum value of visual acuity.…”

Section: Methodsmentioning

confidence: 99%

Individual neural transfer function affects the prediction of subjective depth of focus

Leube

Schilling

Ohlendorf

et al. 2018

Sci Rep

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Attempts to accurately predict the depth of focus (DoF) based on objective metrics have failed so far. We investigated the effect of the individual neural transfer function (iNTF) on the quality of the prediction of the subjective DoF from objective wavefront measures. Subjective DoF was assessed in 22 participants using subjective through focus curves of visual acuity (VA). Objective defocus curves were calculated for visual Strehl metrics of the optical (VSOTFa) and the modulation transfer function as well as the point spread function. DoF was computed for residual lower order aberrations (rLoA) and incorporation of iNTF. Correlations between subjective and objective DoF did not reach significance, when a) standard metrics were used and b) rLoA were considered (rmax = 0.33, pall > 0.05). By incorporating the iNTF of the individuals in the calculation of the objective DoF from the VSOTFa metric, a moderate statistically significant correlation was found (r = 0.43, p < 0.01, Pearson). The iNTF of the individual’s eye is fundamental for the prediction of subjective DoF using the VSOTFa metric. Individualized predictions could aid future application in the correction of refractive errors like presbyopia using intraocular lenses.

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The Influence of Induced Astigmatism on the Depth of Focus

Abstract: With an induced WTR astigmatism of -0.5 DC, the DoF can be enhanced in the near viewing distance with a marginal loss in binocular VA. The approach of using induced WTR astigmatism can lead to novel optical treatments for presbyopia.

Cited by 20 publications

References 36 publications

<p>Spectacle Independence in Patients with Prior Radial Keratotomy Following Cataract Surgery: A Case Series</p>

<p>Spectacle Independence in Patients with Prior Radial Keratotomy Following Cataract Surgery: A Case Series</p>

Comparing surgically induced astigmatism calculated by means of simulated keratometry versus total corneal refractive power

Individual neural transfer function affects the prediction of subjective depth of focus

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