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Related Concept Videos

Faraday Disk Dynamo01:23

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A Faraday disk dynamo is a DC generator, producing an emf that is constant in time. It consists of a conducting disk that rotates with a constant angular velocity in the magnetic field, perpendicular to the disk's plane. The rotation of the disk causes a change in magnetic flux, which induces an emf, causing opposite charges to develop on the rim and in the center of the disk. The polarity of the induced emf can be determined by the direction of the magnetic field and the direction of the...
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Electric Field of a Charged Disk01:23

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The simplest case of a surface charge distribution is the uniformly charged disk. Calculating its electric field also helps us calculate the electric field of a large plane of charge.
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Electrical Current01:10

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Electrical current is defined as the rate at which charge flows. When there is a large current present, such as that used to run a refrigerator, a large amount of charge moves through the wire in a small amount of time. If the current is small, such as that used to operate a handheld calculator, a small amount of charge moves through the circuit over a long period of time. The SI unit for current is the ampere (A), named for the French physicist André-Marie Ampère (1775–1836).
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Current Density01:21

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The total amount of current flowing through one unit value of a cross-sectional area is referred to as current density. If the current flow is uniform, the amount of current flowing through a conductor is the same at all points along the conductor, even if the conductor area varies. The current density consists of the local magnitude and direction of the charge flow, which varies from point to point. Current density is measured in amperes per meter square, and direction is defined as the net...
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Eddy Currents01:25

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Since eddy currents occur only in conductors, magnets can separate metals from other materials. For example, in a recycling center, trash is dumped in batches down a ramp, beneath which lies a powerful magnet. Conductors in the trash are slowed by eddy currents, while nonmetals in the trash move on, separating from the metals. This works for all metals, not just ferromagnetic ones.
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Displacement Current01:19

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Ampère's law, in its usual form, does not work in places where the current changes with time and is not steady. Thus, Maxwell suggested including an additional contribution, called the displacement current, Id, to the real conduction current I.
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Related Experiment Video

Updated: Feb 6, 2026

20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier
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Optic disk pit maculopathy: current management strategies.

Irini Chatziralli1, Panagiotis Theodossiadis1, George P Theodossiadis1

  • 12nd Department of Ophthalmology, University of Athens, Attikon Hospital, Athens, Greece, theodossiadisg@ath.forthnet.gr.

Clinical Ophthalmology (Auckland, N.Z.)
|August 22, 2018
PubMed
Summary
This summary is machine-generated.

Optic disk pit (ODP) maculopathy management involves surgical interventions like vitrectomy. While spontaneous resolution is rare, various surgical techniques offer potential treatment options for this optic nerve head abnormality.

Keywords:
gas tamponadelaseroptic disk pitscleral bucklingtreatmentvitrectomy

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Area of Science:

  • Ophthalmology
  • Retinal Diseases
  • Congenital Abnormalities

Background:

  • Optic disk pit (ODP) is a rare congenital optic nerve head abnormality.
  • ODP can cause significant visual impairment, particularly when associated with macular detachment.
  • Recent imaging advances have improved understanding of ODP pathophysiology.

Purpose of the Study:

  • To review current treatment modalities for ODP maculopathy.
  • To synthesize findings on the efficacy of various therapeutic approaches.

Main Methods:

  • Comprehensive literature search on ODP maculopathy treatments.
  • Analysis of reported surgical and non-surgical management strategies.

Main Results:

  • Spontaneous resolution of ODP maculopathy is infrequently reported.
  • Vitrectomy, often combined with gas tamponade or laser photocoagulation, is a primary surgical approach.
  • Scleral buckling and inner fenestration are alternative surgical options informed by disease pathophysiology.

Conclusions:

  • Management of ODP maculopathy remains clinically challenging.
  • Treatment success rates vary among different modalities, impacting anatomical and functional outcomes.
  • Ongoing research into ODP pathophysiology may refine therapeutic strategies.