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Accessory Structures of the Eye01:17

Accessory Structures of the Eye

Optical perception, or vision, is an extraordinary sense dependent on converting light signals received via the ocular organs. These organs, known as eyes, are securely positioned within the bony cavities of the skull, called orbits. The orbits serve a dual purpose: a protective shield for the ocular globes and a stable attachment point for the soft ocular tissues. The eye's external protective mechanisms include the eyelids, which are edged with lashes that act as a barrier against foreign...
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In this lesson, we delve into the role of ring conformation and its stability, which determines the spatial arrangement and, consequently, the molecular symmetry and stereoisomerism of cyclic compounds. 1,2-Dimethylcyclohexane is used as a case study to evaluate the possible number of stereoisomers. Here, given the multiple (n = 2) chiral centers, there are 2n = 4 possible configurations that lack a plane of symmetry, as the ring skeleton exists in a non-planar chair conformation. In addition,...
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Related Experiment Video

Updated: Jun 5, 2026

Surgical Correction for Pediatric Epiblepharon and Trichiasis
03:59

Surgical Correction for Pediatric Epiblepharon and Trichiasis

Published on: July 8, 2025

Cyclic exotropia in a child.

David Stager1, Preeti J Thyparampil, David R Stager

  • 1UT Southwestern Medical School, Dallas, Texas, USA. stagerdr@aol.com

Journal of AAPOS : the Official Publication of the American Association for Pediatric Ophthalmology and Strabismus
|December 21, 2010
PubMed
Summary
This summary is machine-generated.

Cyclic strabismus, a rare eye alignment disorder, involves alternating eye turns. This case study details alternate-day exotropia in a child, a unique presentation of this condition.

Related Experiment Videos

Last Updated: Jun 5, 2026

Surgical Correction for Pediatric Epiblepharon and Trichiasis
03:59

Surgical Correction for Pediatric Epiblepharon and Trichiasis

Published on: July 8, 2025

Area of Science:

  • Ophthalmology
  • Pediatric Ophthalmology
  • Strabismus Research

Background:

  • Cyclic strabismus is an uncommon condition characterized by alternating misalignment and straightness of the eyes.
  • Alternate-day exotropia is a rare subtype, with limited documented cases.
  • Previous surgical correction for constant esotropia can be a factor in strabismus development.

Observation:

  • A pediatric patient previously treated for constant esotropia presented with a novel strabismus pattern.
  • The patient exhibited exotropia that alternated on a daily basis, specifically occurring every other day.

Findings:

  • The case highlights a rare manifestation of cyclic strabismus: alternate-day exotropia.
  • This presentation occurred in a child with a history of surgical intervention for a different form of strabismus.

Implications:

  • This case expands the understanding of cyclic strabismus variations and their potential development post-surgery.
  • Further research into the mechanisms and management of alternate-day exotropia is warranted.
  • Clinicians should consider cyclic strabismus in the differential diagnosis of intermittent eye misalignment, especially in post-surgical pediatric patients.