Topic
Periocular Region
About: Periocular Region is a research topic. Over the lifetime, 256 publications have been published within this topic receiving 4424 citations.
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TL;DR: Warming the periocular region with water vapor improved subjective amplitude of accommodation, near vision and the effect depended on the amount of water vapor.
3 citations
TL;DR: In both patients, wide excision led to large surgical defects, and perineural invasion prompted adjuvant radiation therapy postoperatively, and ophthalmologists should be aware of DM, its neurotrophic nature, and potential to metastasize with locally advanced lesions.
Abstract: Desmoplastic melanoma (DM) is a rare subtype of melanoma and an even smaller proportion of periocular melanomas. Here, the authors report 2 cases of DM in the periocular region. Staged according to the American Joint Committee on Cancer (AJCC) eighth edition classification, patient 1 presented with a stage IIIC (pT4apN1cM0) DM in the left lateral canthus with upper and lower eyelid and patient 2 presented with a stage IIIB (T4aN1bM0) DM in the left brow and supraorbital region with a parotid lymph node metastasis. In both patients, the lesions were amelanotic, with inflammatory appearance, and had been noted for several years before the correct diagnosis was made. In both patients, wide excision led to large surgical defects, and perineural invasion prompted adjuvant radiation therapy postoperatively. Patient 2 was treated with an immune checkpoint inhibitor for his parotid metastasis. Ophthalmologists should be aware of DM, its neurotrophic nature, and potential to metastasize with locally advanced lesions.
3 citations
TL;DR: Periocular recognition is used in complementary to iris recognition which refers to the region around eyes including eyelashes, eyelids and skin texture by fusing both iris and periocular modalities and gives encouraging results in comparison to the existing approaches.
Abstract: In a non-ideal scenario, iris recognition becomes challenging due to occlusion noise by eyelashes and eyelids, specular reflections and illumination variations. This limits its applicability to be used in real-time applications. Thus, periocular recognition is used in complementary to iris recognition which refers to the region around eyes including eyelashes, eyelids and skin texture. By fusing both iris and periocular modalities, a more reliable and an accurate biometric system is attained that can be considered for high surveillance applications. The proposed techniques are based on continuous orthogonal moments: Zernike moments and polar harmonic transforms which are invariant to rotation and noise. These capture local intensity variations of the neighbourhood pixels that pertain to shape details of the periocular region and random texture pattern of the iris region. The techniques have been evaluated on iris databases: IITD v1 and UBIRIS v2 and a self-developed PEC, Chandigarh periocular database which has been created in a less constrained environment for the research community working on periocular recognition. Results demonstrate that the proposed technique gives encouraging results in comparison to the existing approaches.
3 citations
TL;DR: It is illustrated that LCH rarely presents with periocular infiltration without orbital bone involvement, and is a clinicopathologic diagnosis.
Abstract: Purpose Langerhans cell histiocytosis (LCH) is a disorder of dendritic cell proliferation that typically involves bone. It can be diagnostically challenging when LCH presents without bony involvement, leading to delays in diagnosis and treatment. In this study, the periocular manifestations of LCH in cases where the underlying orbital bones are not involved are described through a systematic review. Methods A systematic review of the literature was performed to capture all cases of LCH that involved the periocular region but not the underlying orbital bones. These included LCH cases that involved the periocular skin, the ocular surface, and the orbital tissue. The authors also highlight an additional case where LCH presented with periocular edema and multifocal, nodular conjunctival lesions. Result This review illustrates that LCH rarely presents with periocular infiltration without orbital bone involvement. In these atypical cases, LCH can present as an eyelid mass, a chalazion-like lesion, generalized periocular swelling, ocular surface lesions, or infiltration of any orbital structure. Ocular surface LCH has a higher rate of recurrence than other periocular LCH. Orbital LCH can involve any tissue including extraocular muscles, the lacrimal gland, or indistinct areas within the orbit. Conclusions LCH is a clinicopathologic diagnosis. Although most cases involve the bone, any soft tissue can be involved. Biopsy is required to confirm the diagnosis of this heterogeneous disease.
3 citations
03 Jul 2019
TL;DR: Two different deep learning pipelines are evaluated, one with a specific segmentation step and one without it, and the positive and negative properties of both of them are shown.
Abstract: The periocular region of a face can be used as an autonomous modality in a biometric recognition system. We evaluate two different deep learning pipelines, one with a specific segmentation step and one without it, and show the positive and negative properties of both of them. The obtained results on the newly introduced public dataset SBVPI show that the periocular region offers enough distinguishing information for successful identity recognition.
2 citations