Ultrasonographic Measurement of Upper Eyelid Thickness in Korean Children with Epicanthus

Lee, Ho-Sun; Lew, Helen; Yun, Young-Soo

doi:10.3341/kjo.2006.20.2.79

Cited by 9 publications

(5 citation statements)

References 9 publications

(15 reference statements)

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“…These measurements were repeated twice per eye and headset. This separation can be referred to as the closed eye relief distance, yet this distance can vary from the natural eye relief due to the upper eyelid thickness (Osuobeni and Al-Mijalli 1997;Lee et al 2006). However, at the same time, the eye translates backward when it is closed (Kirchner et al 2021), and it can be even retracted further due to the pressure applied by the piece of paper.…”

Section: Eye Relief Distancementioning

confidence: 99%

Assessment of consumer VR-headsets’ objective and subjective field of view (FoV) and its feasibility for visual field testing

et al. 2022

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Virtual reality as a research environment has seen a boost in its popularity during the last decades. Not only the usage fields for this technology have broadened, but also a research niche has appeared as the hardware improved and became more affordable. Experiments in vision research are constructed upon the basis of accurately displaying stimuli with a specific position and size. For classical screen setups, viewing distance and pixel position on the screen define the perceived position for subjects in a relatively precise fashion. However, projection fidelity in HMDs strongly depends on eye and face physiological parameters. This study introduces an inexpensive method to measure the perceived field of view and its dependence upon the eye position and the interpupillary distance, using a super wide angle camera. Measurements of multiple consumer VR headsets show that manufacturers’ claims regarding field of view of their HMDs are mostly unrealistic. Additionally, we performed a “Goldmann” perimetry test in VR to obtain subjective results as a validation of the objective camera measurements. Based on this novel data, the applicability of these devices to test humans’ field of view was evaluated.

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Section: Eye Relief Distancementioning

confidence: 99%

Assessment of consumer VR-headsets’ objective and subjective field of view (FoV) and its feasibility for visual field testing

et al. 2022

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“…Tarsal plate, considered to be skeleton of eyelid, consists not of cartilage, but of dense fibrous tissue that gives the eyelid its contour, and functions as stiffener. The eyelid thickness along pupillary axis is 4.25 mm [18].…”

Section: Mathematical Model Of Thermal Effects Of Blinking In Human Eyementioning

confidence: 99%

Mathematical model of thermal effects of blinking in human eye

2015

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Blinking is regarded as the continuous interrupted eyelid closure or opening and its thermal effect will compromise between these two. During a blink, the heat loss via convection, radiation and tear evaporation from cornea is prevented, warm tear is layered across corneal surface and the vessels of the palpebral conjunctiva provide heat to anterior eye. In most of the thermal models in human eye that are found in literatures, effect of blinking is not included, simulation is carried out only in open eye. Thus, in this paper, thermal effects of blinking are investigated using one-dimensional finite element method in transient state case. The bio-heat transfer process is simulated during different blinking rates, lid closure and opening. The simulation is carried out using normal and extreme values of ambient temperatures, blood temperatures, evaporation rates, blood perfusion rates, and lens thermal conductivities. Blinking is found to increase corneal and lens temperature by 1.29 • C and 0.78 • C respectively when compared to open eye. The results obtained from this model are useful in predicting temperature distribution in different laser eye surgeries, hyperthermia and cryosurgery treatment of eyelid carcinoma, choroidal melanoma and can be used for diagnosing temperature-related diseases.

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Section: Eye Geometry and Propertiesmentioning

confidence: 99%

“…Similarly, [C] and [K] are 6 × 6 and 9 × 9 matrices in case of eyelid opening and closure respectively. Now, to get the steady state temperature distribution, we remove the time derivative from (12) and solve the following system of equation:…”

Section: Governing Equation and Boundary Conditionsmentioning

confidence: 99%

Thermal Effects of Eyelid in Human Eye Temperature Model

Gokul¹,

Gurung²,

Adhikary³

2014

Journal of applied mathematics & informatics

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Presence of eyelid on anterior ocular surface and its thermal effects play significant role in maintaining eye temperature. In most of the literatures of thermal modeling in human eye, the eyelid is not considered as an eye component. In this paper, finite element model is developed to investigate the thermal effects of eyelid closure and opening in human eye. Based on different properties and parameter values reported in literatures, the bio-heat transfer process is simulated and compared with experimental results in steady and transient state cases. The sensitivity analysis using various ambient temperatures, evaporation rates, blood temperatures and lens thermal conductivities is carried out. The temperature values so obtained in open eye show a good agreement with past results. The closure of eyelid is found to increase/decrease the eye temperature significantly than its opening, when the parameter values are considered to be at extreme.

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Ultrasonographic Measurement of Upper Eyelid Thickness in Korean Children with Epicanthus

Cited by 9 publications

References 9 publications

Assessment of consumer VR-headsets’ objective and subjective field of view (FoV) and its feasibility for visual field testing

Assessment of consumer VR-headsets’ objective and subjective field of view (FoV) and its feasibility for visual field testing

Mathematical model of thermal effects of blinking in human eye

Thermal Effects of Eyelid in Human Eye Temperature Model

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