Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Beams01:30

Beams

1.9K
Beams are integral components of structural engineering and construction, designed to support loads applied at various points along their length. These long, straight members can be classified based on geometry, cross-section, support type, and equilibrium condition.
Based on geometry, beams can be straight, tapered, or curved. Straight beams are the most common type and have a constant cross-section throughout their length. Tapered beams, on the other hand, have a varying cross-section along...
1.9K
Nuclear Stability03:18

Nuclear Stability

23.2K
Protons and neutrons, collectively called nucleons, are packed together tightly in a nucleus. With a radius of about 10−15 meters, a nucleus is quite small compared to the radius of the entire atom, which is about 10−10 meters. Nuclei are extremely dense compared to bulk matter, averaging 1.8 × 1014 grams per cubic centimeter. If the earth’s density were equal to the average nuclear density, the earth’s radius would be only about 200 meters.
To hold positively charged protons together...
23.2K
RNA Stability01:53

RNA Stability

35.7K
Intact DNA strands can be found in fossils, while scientists sometimes struggle to keep RNA intact under laboratory conditions. The structural variations between RNA and DNA underlie the differences in their stability and longevity. Because DNA is double-stranded, it is inherently more stable. The single-stranded structure of RNA is less stable but also more flexible and can form weak internal bonds. Additionally, most RNAs in the cell are relatively short, while DNA can be up to 250 million...
35.7K
Fixation and Sectioning01:03

Fixation and Sectioning

7.9K
Two basic types of preparation are used to visualize specimens with a light microscope: wet mounts and fixed specimens.
The simplest type of preparation is the wet mount, in which the specimen is placed in a drop of liquid on the slide. A liquid specimen can be directly deposited on the slide using a dropper. Solid specimens, such as skin scraping, can be placed on the slide before adding a drop of liquid to prepare the wet mount. Sometimes the liquid is simply water, but stains are often added...
7.9K
Deflection of a Beam01:19

Deflection of a Beam

723
Accurately determining beam deflection and slope under various loading conditions in structural engineering is crucial for ensuring safety and structural integrity. Singularity functions offer a streamlined approach to analyzing beams, especially when multiple loading functions complicate the bending moment equation.
Singularity functions, described in an earlier lesson, are powerful mathematical tools that represent discontinuities within a function commonly encountered in structural loading...
723
Stability01:28

Stability

415
The time response of a linear time-invariant (LTI) system can be divided into transient and steady-state responses. The transient response represents the system's initial reaction to a change in input and diminishes to zero over time. In contrast, the steady-state response is the behavior that persists after the transient effects have faded.
The stability of an LTI system is determined by the roots of its characteristic equation, known as poles. A system is stable if it produces a bounded...
415

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Peripheral refractive errors in pseudophakic eyes: <i>in vitro</i> evaluation and optical simulation.

Biomedical optics express·2026
Same author

Crystalline Lens Shape During Accommodation in Children.

Ophthalmic & physiological optics : the journal of the British College of Ophthalmic Opticians (Optometrists)·2026
Same author

Principles of a Non-orthogonal Optical Surface with Potential for Correction of Irregular Astigmatism.

Ophthalmic & physiological optics : the journal of the British College of Ophthalmic Opticians (Optometrists)·2026
Same author

Nasotemporal Asymmetry in Ocular Biometry as a Biomarker for Myopia Progression in Chinese Children.

Ophthalmic & physiological optics : the journal of the British College of Ophthalmic Opticians (Optometrists)·2026
Same author

Clinico Socio-Demographic Profile of Children with Autism Spectrum Disorder from a Mental Health Clinic in Nepal: An Observational Study.

JNMA; journal of the Nepal Medical Association·2026
Same author

Screening for Tics Among School-Going Children in Nepal: A Community-Based Cross-Sectional Study.

Journal of child neurology·2026
Same journal

Comparison of neutralization and disinfection kinetics in povidone iodine- and hydrogen peroxide-based soft contact lens care solutions.

Optometry and vision science : official publication of the American Academy of Optometry·2026
Same journal

Agreement between ganglion cell-inner plexiform layer metrics from widefield optical coherence tomography and Goldmann II, III, and V in glaucoma.

Optometry and vision science : official publication of the American Academy of Optometry·2026
Same journal

Repeatability of SpotChecks contrast sensitivity test in macular disease.

Optometry and vision science : official publication of the American Academy of Optometry·2026
Same journal

Reflections on emerging therapies for inherited retinal diseases following a community education event: A qualitative exploration.

Optometry and vision science : official publication of the American Academy of Optometry·2026
Same journal

Optical myopia control interventions: Evaluation of methods and success in a real-world population.

Optometry and vision science : official publication of the American Academy of Optometry·2026
Same journal

Influence of corneal endothelial cell density after penetrating keratoplasty on contact lens induced corneal swelling.

Optometry and vision science : official publication of the American Academy of Optometry·2026
See all related articles

Related Experiment Video

Updated: Jan 31, 2026

Author Spotlight: Exploring Regeneration in Axolotls Through Insights in Cellular and Molecular Mechanisms, Bone Healing, and Implications for Human Therapies
05:45

Author Spotlight: Exploring Regeneration in Axolotls Through Insights in Cellular and Molecular Mechanisms, Bone Healing, and Implications for Human Therapies

Published on: April 12, 2024

963

Fixation Stability with Bessel Beams.

Dipesh Bhattarai1, Marwan Suheimat1, Andrew J Lambert2

  • 1School of Optometry and Vision Sciences and Institute of Health and Biomedical Innovation, Faculty of Health, Queensland University of Technology, Kelvin Grove, Queensland, Australia.

Optometry and Vision Science : Official Publication of the American Academy of Optometry
|January 3, 2019
PubMed
Summary
This summary is machine-generated.

Monitor-based Bessel beams offer superior fixation targets for ophthalmic imaging, improving stability compared to Gaussian beams and traditional bull

More Related Videos

A Reliable and Reproducible Critical-Sized Segmental Femoral Defect Model in Rats Stabilized with a Custom External Fixator
08:20

A Reliable and Reproducible Critical-Sized Segmental Femoral Defect Model in Rats Stabilized with a Custom External Fixator

Published on: March 24, 2019

9.3K
Preparing Adherent Cells for X-ray Fluorescence Imaging by Chemical Fixation
07:54

Preparing Adherent Cells for X-ray Fluorescence Imaging by Chemical Fixation

Published on: March 12, 2015

9.9K

Related Experiment Videos

Last Updated: Jan 31, 2026

Author Spotlight: Exploring Regeneration in Axolotls Through Insights in Cellular and Molecular Mechanisms, Bone Healing, and Implications for Human Therapies
05:45

Author Spotlight: Exploring Regeneration in Axolotls Through Insights in Cellular and Molecular Mechanisms, Bone Healing, and Implications for Human Therapies

Published on: April 12, 2024

963
A Reliable and Reproducible Critical-Sized Segmental Femoral Defect Model in Rats Stabilized with a Custom External Fixator
08:20

A Reliable and Reproducible Critical-Sized Segmental Femoral Defect Model in Rats Stabilized with a Custom External Fixator

Published on: March 24, 2019

9.3K
Preparing Adherent Cells for X-ray Fluorescence Imaging by Chemical Fixation
07:54

Preparing Adherent Cells for X-ray Fluorescence Imaging by Chemical Fixation

Published on: March 12, 2015

9.9K

Area of Science:

  • Ophthalmic imaging
  • Optical physics
  • Biomedical engineering

Background:

  • Stable ocular fixation is crucial for high-resolution ophthalmic imaging instruments.
  • Traditional fixation targets may not provide sufficient stability for advanced imaging techniques.
  • Bessel beams, with their unique propagation characteristics, are being explored to enhance fixation.

Purpose of the Study:

  • To evaluate and compare the fixation stability offered by different types of targets, including monitor-based Bessel beams, laser Bessel beams, and Gaussian beams.
  • To determine the efficacy of monitor-based Bessel images as fixation targets for ophthalmic applications.

Main Methods:

  • 16 participants fixated on seven different targets (monitor-based and laser-based Gaussian and Bessel beams, plus a bull's eye/cross hair) for 20-second intervals.
  • Eye tracking (30 Hz) was used to record eye positions.
  • Standard deviations (σx, σy) and bivariate contour ellipse areas (BCEAs) of fixation were calculated and statistically analyzed.

Main Results:

  • Significant differences in fixation stability (σy and BCEA) were observed across target types (P < .001).
  • Monitor-based Bessel beam targets resulted in significantly smaller vertical eye movements (σy) and fixation areas (BCEAs) compared to bull's eye/cross hair and Gaussian beam targets.
  • No significant difference was found for horizontal eye movements (σx) between target types.

Conclusions:

  • Monitor-based Bessel beam images provide superior fixation stability compared to conventional bull's eye/cross hair targets and monitor-based Gaussian beams.
  • These findings suggest that monitor-based Bessel images are a promising tool for ophthalmic imaging instruments requiring precise and stable ocular fixation.
  • Further research is needed to confirm the benefits of laser Bessel beams over laser Gaussian beams for fixation.