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Related Concept Videos

Aging01:26

Aging

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Aging is a complex biological phenomenon influenced by various processes that affect cellular and systemic functions. Several prominent theories attempt to explain its mechanisms, highlighting cellular limitations, oxidative damage, and hormonal changes as central factors in aging.
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In 1928, a German botanist Emil Heitz observed the moss nuclei with a DNA binding dye. He observed that while some chromatin regions decondense and spread out in the interphase nucleus, others do not. He termed them euchromatin and heterochromatin, respectively. He proposed that the heterochromatin regions reflect a functionally inactive state of the genome. It was later confirmed that heterochromatin is transcriptionally repressed, and euchromatin is transcriptionally active chromatin.
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The position of an object defines its location relative to a convenient frame of reference at any particular time. A frame of reference is an arbitrary set of axes from which the position and motion of an object are described. Earth is often used as a frame of reference, and we often describe the position of an object as it relates to stationary objects on Earth. For example, a rocket launch could be described in terms of the position of the rocket with respect to Earth as a whole. On the other...
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The serial position effect is a cognitive phenomenon where individuals are more likely to recall the first and last items in a list compared to those in the middle. This effect is divided into the primacy effect and the recency effect. The primacy effect is observed when the initial items in a list are remembered better. This occurs because these items are rehearsed more frequently or receive more elaborative processing, allowing them to be encoded into long-term memory more effectively. For...
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Several body functions deteriorate with age. The external signs of aging are easily identifiable. For example, the skin becomes dry, less elastic, and thins out, forming wrinkles. The skin of the face begins to appear looser due to a decrease in the levels of elastic and collagen fibers in the connective tissue. Additionally, melanin production in the hair follicle decreases with age, resulting in gray hair. Moreover, the senses of sight and hearing decline, so glasses and hearing aids may...
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A position vector is a fundamental concept in mathematics that helps determine the position of one point with respect to another point in space. It is a vector that describes the direction and distance between two points. Position vectors are highly useful in the field of math and science, as they help represent spatial relationships and make calculations easier.
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Methods to Study Changes in Inherent Protein Aggregation with Age in Caenorhabditis elegans
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Exploring Brow Position Changes with Age in Koreans.

Noh Seung Yoon1, Hee Bae Ahn2

  • 1Department of Ophthalmology, Dong-A University College of Medicine, Busan, Korea.

Korean Journal of Ophthalmology : KJO
|February 13, 2019
PubMed
Summary
This summary is machine-generated.

Korean individuals experience age-associated brow drooping, particularly after age 61. This study quantifies brow position changes with aging in the Korean population, offering insights for cosmetic surgery.

Keywords:
AgingBrow positionLateral browPtosis

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Area of Science:

  • Gerontology
  • Facial Plastic Surgery
  • Ophthalmology

Background:

  • Age-associated brow drooping is well-documented in Western populations.
  • Limited research exists on brow position changes with aging in Asian, specifically Korean, individuals.

Purpose of the Study:

  • To investigate age-related changes in brow position among Korean adults.
  • To establish baseline data for potential corrective surgery guidelines in this demographic.

Main Methods:

  • 300 Korean adults aged 18+ were analyzed using digital photography and ImageJ software.
  • Key parameters measured included marginal reflex distance-1, brow-to-pupil distance, and various angular and linear brow measurements.
  • Participants were categorized into three age groups (18-40, 41-60, >61) for comparative analysis using ANOVA.

Main Results:

  • Significant age-related differences in marginal reflex distance-1, brow-to-pupil distance, and brow angle were observed between younger and older groups (especially >61 years).
  • Lateral brow position showed significant changes between the youngest (18-40) and middle (41-60) age groups.
  • Nasal ala-lateral brow distance did not exhibit significant variation across the studied age groups.

Conclusions:

  • Korean individuals, similar to Westerners, exhibit lateral brow drooping with aging.
  • The most pronounced age-associated brow changes in Koreans are evident in individuals over 61 years old.
  • Findings contribute to understanding Asian facial aging and provide data for surgical planning.