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Anatomy - Eyelid

Our eyes are probably {the} most important vital structures we have in our body. They discovered on {the} surface by a thin layer of skin and soft tissue called {the} eyelids. The eyelids serve multiple purposes including protecting {the} eyeball from injury, controlling {the} amount of light that enters {the} eye and also constantly lubricating {the} eyeball with tears secreted by {the} lacrimal gland during blinking. All these functions together help maintain {the} structural integrity of {the} eyeball and protect them from external influences.

 

From an anatomical point of view, {the} eyelid consists primarily of skin, underlying soft tissue also called a subcutaneous tissue and a thin layer of muscle called {the} orbicularis oculi. Under this muscle are other issues that divide {the} area into different planes. These are called septum and include {the} fibrous orbital septum and tarsi. In addition to this, in order for {the} eyelids to open are lid retractors that help assist blinking. Finally, there also exists a small amount of fat tissue as well. The eyeball is covered by a thin layer of tissue called {the} conjunctiva.

Anatomy of {the} eyelid

The description above only offers a superficial overview of {the} anatomy of {the} eyelid. If one were to look at {the} eyelid in a more detailed manner, a sagittal section taken across {the} eyelid will offer a clear view of {the} various structures that form it. Of course, it must be borne in mind that {the} structures that are visualised depend on {the} plane at which {the} sections are taken.

As mentioned above, {the} tissues can be divided into planes by structures called {the} septum. The orbital septum differentiates {the} orbital tissue from {the} lid. Behind {the} septum are a number of different other structures, a knowledge of which is essential if surgery is to be performed. In particular, it is essential to identify {the} anterior and posterior lamellae. In essence, {the} anterior lamella consists of {the} skin and {the} orbicularis oculi muscle while {the} posterior lamella consists of {the} conjunctiva and {the} tarsus.

Let's take a look at {the} structures of {the} eyelid in a bit more detail.

 

 

 

Skin categories Skin color in unexposed area Tanning history Skin Sensitivity Value
never tans, always burns pale or milky, white alabaster develops red sunburn, painful swelling, skin peels 4-10
may be tans, usually burns very little brown, may be freckles usually burns, pink or red coloring appears, can gradually develop light brown tan 10-12
usually tans, may be burns light tan, brown or olive, distinctly pigmented rarely burns, moderately rapid tanning response 11-14
always tans, rarely burns brown, dark brown or black rarely burns, very rapid tanning response 12-16

 

Classification developed by EPA (US Environmental Protection Agency).

 

  

 Skin Lotion Facts / Skin Cancer Facts

  • What should you consider when you are looking for sun screen protection?The definition of radiation is "The process in which energy is emitted from molecules and atoms owing to internal change." (from Webster's Dictionary)UVB cause "burn appearance" UVB is most prevalent on sunny days from 10:00 am to 2:00 p.m.
    • The frequency range should cover 280 to 400 nanometers. The greatest concern lies between 290 and 360 nanometers. DNA damage does occur in {the} UVB spectrum.
  • The sun protection factor (SPF) addresses {the} time it takes for your skin to burn. The number signifies, in general, period of time (minutes) that it takes {the} average Caucasian skin to burn with sun screen versus not wearing one.
  • There are several shortcomings of {the} "SPF System".A suntan lotion can offer 99% UVB protection and minimal UVA absorbency, yet it is classified as "broad spectrum" in {the} United States.
    • There is a significant variance between products using "similar SPF"
    • SPF only relates UVB and has nothing to do with UVA radiation; UVA radiation causes "aging appearance." UVA exists in rain or shine from sunrise to sunset 365 days a year.
    • UVA causes long term damage that could not appear for years
    • UVB and UVA radiation are both know to cause skin cancer.
    • Because SPF rating does not acknowledge {the} specific amount of absorption in {the} UVB range and {the} FDA does not have a monograph for UVA production. There is no definitive measure in {the} United States to assess {the} efficacy of a suntan product for UVA and UVB production
  • Did you know that various sunscreens break down within hours and must be reapplied often?
    • Recent medical studies have proven that products utilizing Avobenzone (Parsol 1789) degrade and lose their ability to block further radiation. This degradation occurs upon exposure to sunlight! Other studies have demonstrated that a chemical reaction can occur with {the} active Methoxycinnamate ingredient destroying it and leaving users susceptible to large UVB exposure.