According to the Centers for Disease Control and Prevention (CDC), children in U.S. public schools miss 3 million schools days each year due to pink eye. According to the agency, pink eye, or conjunctivitis, is one of the most common and treatable eye conditions in the world and it can affect both children and adults.
Pink eye is an inflammation of the thin, clear tissue that lines the inside of the eyelid (conjunctiva) and the white part of the eyeball. This inflammation makes blood vessels more visible and gives the eye a pink or reddish color.
The CDC reports that some of the main causes and types of pink eye include:
• Viral Conjunctivitis – which is caused by a number of different viruses, such as adenoviruses, and can be very contagious.
• Bacterial Conjunctivitis – there are several types of bacteria that can cause this (Staphylococcus aureus, Streptococcus pneumoniae, Haemophilus influenzae, Moraxella catarrhalis, or, less commonly, Chlamydia trachomatis and Neisseria gonorrhoeae) and some of these can be easily spread.
• Allergic Conjunctivitis – This is not contagious and is a result of the body’s reaction to allergens, such as pollen from trees, plants, grasses and weeds; dust mites; molds; pet dander; medicines; or cosmetics.
• Conjunctivitis Caused by Irritants – This is also not contagious and is caused by irritation from a foreign body in the eye or contact with swimming pool chlorine, smoke, dust, fumes or chemical vapors. The airborne irritants could be from indoor or outdoor pollution.
In addition to these, there are also other less common causes of pink eye, such as exposure to ameba, parasites and other substances.
According to the CDC, the contagious forms of pink eye can spread from person to person in different ways, often from an infected person to others through:
• Close personal contact, such as touching or shaking hands
• The air by coughing and sneezing
• Touching an object or surface with germs on it, then touching the eyes before washing one’s hands
These are just a few things to know about pink eye and the more common causes of the condition. To learn more about microbial, air quality and environmental causes or other health and safety exposure issues, please visit the websites shown below.
Clark Seif Clark https://www.csceng.com
EMSL Analytical, Inc. https://www.emsl.com
LA Testing https://www.latesting.com
Zimmetry Environmental https://www.zimmetry.com
Healthy Indoors Magazine https://www.healthyindoors.com
This video will cover the basics of eye accommodation. Included are the basics of the suspensory ligaments (zonules), lens, and ciliary body muscle functions with regard to how it focuses your eye. Video Rating: / 5
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Conjunctivitis, commonly referred to as pinkeye, is a common condition affecting one or both eyes. It is characterized by inflammation of the conjunctiva, the mucous membrane covering the white of the eyes and the inner surface of the eyelids. Conjunctivitis may resolve on its own but sometimes requires treatment. It does not cause any permanent eye or vision changes.
Causes.
Conjunctivitis most often results from a viral infection. Other causes include bacteria, allergy to dust or pollen, exposure to irritants such as smoke, dirt or certain shampoos, as well as prolonged use of contact lenses. Infectious conjunctivitis is highly contagious so precautions should be taken to avoid spreading the condition to others.
Signs and Symptoms.
Common symptoms of conjunctivitis include redness of the eyes and pain with swelling of the eyelids. There may also be excessive tear flow and thick yellow-colored discharge from the eyes. The eyelids may become sticky with crust formation noticed especially on arising from sleep. You may also experience itchiness, blurry vision and increased sensitivity to light.
Diagnosis.
Your doctor will diagnose conjunctivitis based on your symptoms and a physical examination of the eyes. Fluid discharge may be obtained with a swab of the conjunctiva and sent to the laboratory for analysis. This helps your doctor find out the type of infection to decide on the appropriate treatment.
Treatment.
The treatment for conjunctivitis depends on its cause.
Viral conjunctivitis does not usually require treatment and symptoms should fade in about 2-3 weeks as the infection resolves. Antiviral medications may be prescribed.
In cases of bacterial infection, your doctor will prescribe antibiotic medications in the form of eye-drops or ointment.
Warm compresses applied over the eye may help soothe your symptoms if you have viral or bacterial conjunctivitis.
Allergic conjunctivitis responds to anti-allergic medicines such as antihistamines, steroids, ant-inflammatory drugs and decongestants. Cool compresses may also be helpful. Avoiding the substance that causes your allergic symptoms whenever possible is often the best solution to preventing allergic conjunctivitis.
Prevention.
Maintaining good hygiene helps prevent the spread of conjunctivitis. Wash your hands often and do not touch or rub your eyes. Avoid sharing towels or eye cosmetics. Change the pillow covers and bed linens frequently. If you use contact lenses, handle them carefully and follow a proper cleaning regimen. Video Rating: / 5
Your eyes see, but how does vision happen? Find out how the eyes and brain work together in this eye video. Video Rating: / 5
The eye is the organ of sight and is shaped as a slightly irregular hollow sphere. Various structures in the eye enable it to translate light into recognizable images. Among these are the cornea, the lens, and the retina.
Light first passes through the cornea, a clear dome-like structure covering the iris, or colored part, of the eye. The cornea bends, or refracts, the light onto the lens. The light is then refracted a second time while passing through the lens, finally focusing on the retina. The retina is the light sensitive part of the eye. Impulses travel down the optic nerve to the occipital lobe of the brain, which then interprets the image in the correct perspective.
The shape of the eye is very important in keeping the things we see in focus. If the shape of the eye changes, it affects a person’s vision.
Normally, light is precisely focused onto the retina at a location called the focal point. A nearsighted eye is longer from front to back than a normal eye causing light to be focused in front of the retina instead of directly onto it. This makes it difficult to see objects that are far away. Glasses with concave lenses are used to correct nearsightedness. The concave lens focuses light back onto the focal point of the retina.
Farsightedness occurs when the length of the eye is too short. Light is focused at a point behind the retina, making it difficult to see objects that are up close. A convex lens is used to correct farsightedness because it directs the focal point back onto the retina.
How Your Eyes Work
When light rays reflect off an object and enter the eyes through the cornea (the transparent outer covering of the eye), you can then see that object. Rods and Cones in the retina
The cornea bends, or refracts, the rays that pass through the round hole of the pupil. The iris (the colored portion of the eye that surrounds the pupil) opens and closes, making the pupil bigger or smaller. This regulates the amount of light passing through.
The light rays then pass through the lens, which changes shape so it can further bend the rays and focus them on the retina. The retina, which sits at the back of the eye, is a thin layer of tissue that contains millions of tiny light-sensing nerve cells. These nerve cells are called rods and cones because of their distinct shapes.
Cones are concentrated in the center of the retina, in an area called the macula. When there is bright light, cones provide clear, sharp central vision and detect colors and fine details.
Rods are located outside the macula and extend all the way to the outer edge of the retina. They provide peripheral or side vision. Rods also allow the eyes to detect motion and help us see in dim light and at night.
These cells in the retina convert the light into electrical impulses. The optic nerve sends these impulses to the brain, which produces an image.
The human eye is an organ that reacts to light and has several purposes. As a sense organ, the mammalian eye allows vision. Rod and cone cells in the retina allow conscious light perception and vision including color differentiation and the perception of depth. The human eye can distinguish about 10 million colors and is possibly capable of detecting a single photon.
Similar to the eyes of other mammals, the human eye’s non-image-forming photosensitive ganglion cells in the retina receive light signals which affect adjustment of the size of the pupil, regulation and suppression of the hormone melatonin and entrainment of the body clock.
Visual perception is the ability to interpret the surrounding environment by processing information that is contained in visible light. The resulting perception is also known as eyesight, sight, or vision (adjectival form: visual, optical, or ocular). The various physiological components involved in vision are referred to collectively as the visual system, and are the focus of much research in Linguistics, psychology, cognitive science, neuroscience, and molecular biology, collectively referred to as vision science.
Light entering the eye is refracted as it passes through the cornea. It then passes through the pupil (controlled by the iris) and is further refracted by the lens. The cornea and lens act together as a compound lens to project an inverted image onto the retina.
The retina consists of a large number of photoreceptor cells which contain particular protein molecules called opsins. In humans, two types of opsins are involved in conscious vision: rod opsins and cone opsins. (A third type, melanopsin in some of the retinal ganglion cells (RGC), part of the body clock mechanism, is probably not involved in conscious vision, as these RGC do not project to the lateral geniculate nucleus but to the pretectal olivary nucleus.) An opsin absorbs a photon (a particle of light) and transmits a signal to the cell through a signal transduction pathway, resulting in hyper-polarization of the photoreceptor. Rods and cones differ in function. Video Rating: / 5
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1. 3:00 Taping down bottom lashes
2. Where I place the Lashes and why
3. 4:45 How I select the curl and length of the lashes (.15 D 11,13,15)
4. 5:45 For straight lashes what are the options lash lift or extensions options
5. 6:50 start isolating and applying the lashes
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Having difficulties in applying your eye drops? Here’s a step-by-step guide. Remember to observe good hand hygiene!
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Alcon Inc. presents a video on tear film abnormalities in dry eye conditions and the mechanism of action of Systane Ultra eye drops. Published with permission of Alcon Labs. All rights reserved by Alcon Inc. Copyright 2010. Dr. Cohen serves as a paid consultant to Alcon Inc. yet has no commercial interest in this product and received no funding to host this video.
There is no monetization of this video and no profit made or received through hosting this video by Dr. Cohen.
