25 research outputs found
Softec HD hydrophilic acrylic intraocular lens: biocompatibility and precision
Intraocular lens development is driven by higher patient expectations for ideal visual outcomes. The recently US Food and Drug Administration-approved Softec HD™ lens is an aspheric, hydrophilic acrylic intraocular lens (IOL). The hydrophilic design of the lens is optimized to address dysphotopsia while maintaining biocompatibility, optical clarity, resistance to damage, and resistance to biocontamination. Aspheric lenses decrease postoperative spherical aberration. The addition of the Softec lens provides clinicians with another option for IOL placement; however, randomized comparative studies of this lens to others already on the market remain to be completed
GLSFormer: Gated - Long, Short Sequence Transformer for Step Recognition in Surgical Videos
Automated surgical step recognition is an important task that can
significantly improve patient safety and decision-making during surgeries.
Existing state-of-the-art methods for surgical step recognition either rely on
separate, multi-stage modeling of spatial and temporal information or operate
on short-range temporal resolution when learned jointly. However, the benefits
of joint modeling of spatio-temporal features and long-range information are
not taken in account. In this paper, we propose a vision transformer-based
approach to jointly learn spatio-temporal features directly from sequence of
frame-level patches. Our method incorporates a gated-temporal attention
mechanism that intelligently combines short-term and long-term spatio-temporal
feature representations. We extensively evaluate our approach on two cataract
surgery video datasets, namely Cataract-101 and D99, and demonstrate superior
performance compared to various state-of-the-art methods. These results
validate the suitability of our proposed approach for automated surgical step
recognition. Our code is released at:
https://github.com/nisargshah1999/GLSFormerComment: Accepted to MICCAI 2023 (Early Accept
Cross-Dataset Adaptation for Instrument Classification in Cataract Surgery Videos
Surgical tool presence detection is an important part of the intra-operative
and post-operative analysis of a surgery. State-of-the-art models, which
perform this task well on a particular dataset, however, perform poorly when
tested on another dataset. This occurs due to a significant domain shift
between the datasets resulting from the use of different tools, sensors, data
resolution etc. In this paper, we highlight this domain shift in the commonly
performed cataract surgery and propose a novel end-to-end Unsupervised Domain
Adaptation (UDA) method called the Barlow Adaptor that addresses the problem of
distribution shift without requiring any labels from another domain. In
addition, we introduce a novel loss called the Barlow Feature Alignment Loss
(BFAL) which aligns features across different domains while reducing redundancy
and the need for higher batch sizes, thus improving cross-dataset performance.
The use of BFAL is a novel approach to address the challenge of domain shift in
cataract surgery data. Extensive experiments are conducted on two cataract
surgery datasets and it is shown that the proposed method outperforms the
state-of-the-art UDA methods by 6%. The code can be found at
https://github.com/JayParanjape/Barlow-AdaptorComment: MICCAI 202
A Comparison of the American Society of Cataract and Refractive Surgery post-myopic LASI K/PRK Intraocular Lens (IOL) calculator and the Ocular MD IOL calculator
David L DeMill1, Majid Moshirfar1, Marcus C Neuffer1, Maylon Hsu1, Shameema Sikder21John A Moran Eye Center, University of Utah, Salt Lake City, UT, USA; 2Wilmer Eye Institute, Johns Hopkins University, Baltimore, MD, USABackground: To compare the average values of the American Society of Cataract and Refractive Surgery (ASCRS) and Ocular MD intraocular lens (IOL) calculators to assess their accuracy in predicting IOL power in patients with prior laser-in-situ keratomileusis (LASIK) or photorefractive keratectomy.Methods: In this retrospective study, data from 21 eyes with previous LASIK or photorefractive keratectomy for myopia and subsequent cataract surgery was used in an IOL calculator comparison. The predicted IOL powers of the Ocular MD SRK/T, Ocular MD Haigis, and ASCRS averages were compared. The Ocular MD average (composed of an average of Ocular MD SRK/T and Ocular MD Haigis) and the all calculator average (composed of an average of Ocular MD SRK/T, Ocular MD Haigis, and ASCRS) were also compared. Primary outcome measures were mean arithmetic and absolute IOL prediction error, variance in mean arithmetic IOL prediction error, and the percentage of eyes within ±0.50 and ±1.00 D.Results: The Ocular MD SRK/T and Ocular MD Haigis averages produced mean arithmetic IOL prediction errors of 0.57 and –0.61 diopters (D), respectively, which were significantly larger than errors from the ASCRS, Ocular MD, and all calculator averages (0.11, –0.02, and 0.02 D, respectively, all P < 0.05). There was no statistically significant difference between the methods in absolute IOL prediction error, variance, or the percentage of eyes with outcomes within ±0.50 and ±1.00 D.Conclusion: The ASCRS average was more accurate in predicting IOL power than the Ocular MD SRK/T and Ocular MD Haigis averages alone. Our methods using combinations of these averages which, when compared with the individual averages, showed a trend of decreased mean arithmetic IOL prediction error, mean absolute upper limit of IOL prediction error, and variance, while increasing the percentage of outcomes within ±0.50 D.Keywords: laser-in-situ keratomileusis, photorefractive keratectomy, intraocular lens calculator, ocular MD, American Society of Cataract and Refractive Surger
The Incidence of Central Serous Chorioretinopathy after Photorefractive Keratectomy and Laser In Situ Keratomileusis
Purpose. To assess the incidence of central serous chorioretinopathy (CSCR) following laser in situ keratomileusis (LASIK) and photorefractive keratectomy (PRK).
Methods.
A chart review was performed to identify all patients with CSCR and a previous history of LASIK or PRK.
Results. Over the 6-year study period, 1 of 4,876 eyes which had LASIK or PRK at the Moran Eye Center was diagnosed with CSCR. One other patient was referred from an outside center, developed CSCR symptoms one month after PRK. Both patients were managed conservatively with a final visual acuity of 20/20 or better. All other patients presented 4 or more years after refractive surgery.
Conclusions. We report the first 2 CSCR cases developing within one month after PRK. The low incidence argues against a causal association. Topical corticosteroids or anxiety may elevate cortisol levels presenting therapeutic challenges for the management of CSCR after PRK or LASIK
Femtosecond-assisted preparation of donor tissue for Boston type 1 keratoprosthesis
We describe a technique for femtosecond laser-assisted preparation of donor tissue for Boston type 1 keratoprosthesis to provide accurate double punching of the donor tissue for optimized alignment in the visual axis. The technique was reproducibly performed in four donor corneas mounted in an artificial anterior chamber. This technique can provide optically centered donor tissue with smooth trephinated edges