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Why Do Onions Make Us Cry?

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Why Do Onions Make Us Cry?

Onions are one of the most common staple foods around the globe. Ironically, for a vegetable so delicious, they can often be tear-jerkers.

Read on to learn why onions cause your eyes to tear and sting, and what you can do to minimize discomfort.

Why Does Cutting Onions Cause Tearing?

Onions produce a sulfur compound called propyl sulfoxide that is stored in the cells of the onion bulb (the part of the onion we eat). Onions grow underground, where they can be eaten by all types of creatures. This odorous sulfuric compound acts as a deterrent to small animals with big appetites.

When one slices into an onion and breaks open its cells, the sulfur compound is released and mixes with the moisture in the air — turning it into smelly and irritating sulfuric acid. When this chemical rises up and comes in contact with your eyes, it stings!

To keep your eyes from potentially being damaged from this chemical exposure, your brain triggers your eyes to tear and flush out the irritating gas particles. Once enough tears have flushed out the sulfuric acids particles from the eye, clear vision and comfort is usually restored. Although your eyes may sting and feel unpleasant, symptoms are temporary and the sulfuric acid won’t damage your eyes.

How Can I Reduce Eye Discomfort When Chopping Onions?

Most experienced chefs will tell you that chilling your onions in the fridge for at least 30 minutes before slicing them will reduce the amount of tearing they cause. Propyl sulfoxide escapes slower in cooler temperatures, reducing the amount of sulfuric acid in the air.

You can also try cutting the onions at arm’s length, or direct the odorous air away with a small fan. Some say that chopping onions immersed in water also helps. Another option is to wear kitchen goggles to protect your eyes.

Furthermore, try to use fresh onions whenever possible. The longer an onion has been stored, the more likely it will induce tearing and discomfort. Try to avoid slicing near the root end of the bulb, as that area has the highest concentration of sulfuric compounds.

Still Having Eye Problems Out of the Kitchen?

If you frequently suffer from eye irritation — and not just while cutting onions — we can help. At The Vision Centers, we treat a wide range of eye conditions and can provide you with the treatment and relief you seek.

For further questions or to schedule an eye exam, call us today.

At The Vision Centers, we put your family’s needs first. Talk to us about how we can help you maintain healthy vision. Call us today: 702-254-6222 or book an appointment online to see one of our Las Vegas eye doctors.

Want to Learn More? Read on!

Frequently Asked Questions with Dr. Christopher Chiodo, OD

Q: What exactly is glaucoma?

  • A: Glaucoma is a condition in which the eye’s intraocular pressure (IOP) is too high. This means that your eye has too much aqueous humor in it, either because it produced too much, or because it’s not draining properly. Other symptoms are optic nerve damage and vision loss. Glaucoma is a silent disease that robs the patient of their peripheral vision. Early detection is very important.

Q: What’s the difference between vision insurance and eye insurance?

  • A: Vision insurance” really isn’t insurance, but rather a benefit that covers some of your costs for eyewear and eye care. It is meant to be used for “routine” care when you aren’t having a problem but want to be sure everything is OK, like having an annual screening exam with your Primary Care Physician. It often, but not always, includes a discount or allowance toward glasses or contact lenses. It is usually a supplemental policy to your medical health insurance. Medical health insurance covers, and must be used when an eye health issue exists. This includes pink eye, eye allergies, glaucoma, floaters, cataracts, diabetes, headaches, and many other conditions. Blurry vision is covered medically if it relates to a medical condition, for example the development of a cataract. For some reason, however, it is considered non-medical if the only finding is the need for glasses or a change of prescription. Of course you can’t know this until you have the exam. In this case, with vision coverage, you would only be responsible for your co-pay, but with medical coverage without vision coverage, you’d be responsible for the usual charge.

Q: How does high blood pressure affect vision?

  • A: If the blood pressure is very high it can be called malignant hypertension and cause swelling of the macula and acute loss of vision. Otherwise hypertension can cause progressive constriction of the arterioles in the eye and other findings. Usually high blood pressure alone will not affect vision much, however hypertension is a known risk factor in the onset and/or progression of other eye disease such as glaucoma, diabetic retinopathy, and macular degeneration as well as blocked veins and arteries in the retina or nerve of the eye that can severely affect vision.

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REFERENCES

https://www.britannica.com/story/why-do-onions-make-you-cry

https://theconversation.com/why-do-onions-make-you-cry-129519

15 Things You Do That Can Harm Your Eyes

Eye health isn’t just about going for that yearly eye exam. Certain actions you take (or don’t take) in your daily routine can also have drastic effects on the health of your eyes and vision. Here’s our list of 15 things you may be doing that could pose damaging risks to your eyes.

It’s important to note that before changing any of your habits, consult with a medical professional to make sure they are right for you and your overall health.

1. Smoking

We all know that smoking can cause heart disease and cancer, but its effects on the eyes are far less known to many. The truth is that smoking can actually lead to irreversible vision loss by significantly increasing the risk of developing macular degeneration, cataracts, glaucoma, and diabetic retinopathy. It can also cause dry eye syndrome. If you are a smoker, do your eyes (and body) a favor and try to kick or reduce the habit.

2. Not Wearing Sunglasses

Exposing your eyes to the sun’s harmful UV radiation can damage the eye’s cornea and lens. Overexposure to UV rays can also lead to cataracts and even eye cancer. That’s why it’s important to always wear 100% UV-blocking sunglasses while outdoors, all four seasons of the year. Always check the sunglasses have FDA approval.

3. Sleeping with Makeup On

When you sleep with eyeliner or mascara, you run the risk of the makeup entering the eye and irritating the cornea. Sleeping with mascara on can introduce harmful bacteria to the eye and cause an infection. Abrasive glitters and shimmery eyeshadow can scratch the cornea as well. Be careful to remove all makeup with an eye-safe makeup remover before going to bed.

4. Buying Decorative Contact Lenses Without a Prescription

Although ordering decorative lenses without first visiting your optometrist may sound more convenient, purchasing them without a prescription isn’t worth the long term risks. Decorative contact lenses are sometimes made by unlicensed manufacturers who tend to use poor-quality or toxic materials that can get absorbed through the eyes into the bloodstream. They also may contain high levels of microorganisms from unsanitary packaging and storage conditions.

5. Not Washing Your Hands Thoroughly

Frequently washing your hands helps to reduce the possibility of bacteria and viruses entering the eye. Pink eye (conjunctivitis) and corneal ulcers are common eye conditions that can be caused by bacteria, viruses, fungi, or parasites. When washing your hands, be sure to use warm water, soap, and thoroughly wash in between each finger and over the entire palm area. If you plan to insert or remove your contact lenses, wash and then dry your hands completely with a lint-free cloth or paper towel.

6. Overwearing Contact Lenses

Wearing contact lenses for longer periods of time than intended can lead to inflammation of the cornea (keratitis), conjunctivitis, eyelid swelling, and contact lens intolerance. Always follow the recommended wear time as instructed by your optometrist.

7. Being Nutrient Deficient

Poor nutrition can cause permanent damage to the visual system. Try to include lots of nutrient-rich fruits and vegetables in your diet, along with adequate amounts of Omega-3. Some of the best vitamins and nutrients for eye health include Vitamins A, C, E, lutein, zeaxanthin, and zinc.

8. Using Non-FDA Approved Products

Whether it’s eyebrow enhancers, eye makeup, or eyelash growth serums, always choose products that have been FDA approved and/or meet government safety regulations. Non-approved products have been known to cause infections or allergic reactions in or around the eye area.

9. Not Cleaning Your Contacts Properly

If you are wearing contact lenses that need to be replaced once every two weeks or once a month, maintaining the highest level of contact lens hygiene is essential. Optometrists will tell you that a common reason patients come in to see them is due to an eye infection from contact lenses that haven’t been properly cleaned or stored. Some patients use their contact lens cases for too long, which can also cause eye irritation. To avoid eye infections, carefully follow your eye doctor’s instructions on how to clean, store, and handle your contact lenses.

10. Showering or Swimming with Contact Lenses

There is a significant amount of bacteria that can be carried in tap water and swimming pools. For this reason, it’s important to make sure that water and contact lenses don’t mix. If you need vision correction while swimming, it may be worth investing in a pair of prescription swimming goggles.

11. Not Following Medication Instructions

When it comes to eye disease, following the medication instructions is crucial. Forgetting to insert eye drops, or administering the incorrect dosage could dramatically reduce the effectiveness of treatment, or even do harm. Speak with your eye doctor if you’re not sure about when or how to take your medication.

12. Not Taking a Holistic Approach

Your eyes are just one part of the whole system — your body. Ignoring health conditions you may have, like high blood pressure or elevated blood sugar, can pose serious risks to your eyes.

13. Not Wearing Protective Eyewear

Shielding your eyes with protective glasses or goggles while working with potentially sharp or fast-moving objects, fragments or particles (wood working, cutting glass, welding, doing repairs with nails, certain sports) is the best defense against eye injury. In fact, 90% of all eye injuries could have been prevented by wearing protective eyewear.

14. Using Unsafe Home Remedies

Some might think that because something is “natural” that it is safe for use around the delicate eye area. Home remedies, like using breastmilk to cure pink eye, could introduce harmful bacteria to the eye and cause infection. If your eyes are giving you trouble, make an appointment to see your local optometrist.

15. Skipping Your Recommended Eye Exam

Your eye doctor will advise you how often you need to come for an eye examination. Adults should visit their eye doctor at least every year for a comprehensive eye exam to determine whether their optical prescription is up-to-date, and to check for the beginning stages of eye disease. Catching eye diseases in their early stages offers the best chance of successful treatment and preserving healthy vision for life.

At The Vision Centers, we put your family’s needs first. Talk to us about how we can help you maintain healthy vision. Call us today: 702-254-6222 or book an appointment online to see one of our Las Vegas eye doctors.

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The Best Foods for Your Eyes

We all know that eating nutrient-rich foods, drinking plenty of water, and exercising can boost our health. So it’s no surprise that these same activities also support eye health. Research has shown that regularly consuming certain vitamins and nutrients can actually prevent or delay sight-threatening eye conditions and diseases such as macular degeneration, cataracts, and glaucoma. 

Here’s a list of the best vitamins, minerals, and nutrients that can help keep your eyes healthy for a lifetime. 

We invite you to consult with our eye doctor, Dr. Christopher Chiodo, OD, to discuss which nutrients are most suited to your specific eye health and needs. 

Vitamins and Nutrients That Support Eye Health

*Always best to speak with your primary care doctor before taking any vitamins or supplements, and to ensure you consume the correct dosage for your body.

Vitamin A

Vitamin A deficiency can cause a host of eye health issues, including dry eyes and night blindness. In fact, vitamin A deficiency is a leading cause of blindness worldwide.

Vitamins A and A1, which are essential for supporting the eye’s photoreceptors (the light-sensing cells) in the retina, can be found in foods like carrots, leafy greens, egg yolks, liver, and fish. 

Omega-3 Fatty Acids

Eating Omega-3 rich foods like fatty fish can support eye health in a few ways. DHA and EPA, 2 different types of Omega-3 fatty acids, have been shown to improve retinal function and visual development.  

Omega-3 supplements can also ease dry eye symptoms. A randomized controlled study found that people who consumed Omega-3 supplements experienced improved tear quality, which resulted in reduced tear evaporation and increased eye comfort.  

Lutein and Zeaxanthin

Lutein and zeaxanthin are antioxidants that accumulate in the lens and retina and help filter out damaging UV rays and blue light. One study showed that individuals who had the highest levels of these nutrients in their diets had a 43% lower chance of developing macular degeneration than those who had consumed the least amount.  

Spinach, egg yolks, sweet corn, and red grapes are some of the foods that contain high levels of lutein and zeaxanthin. 

Vitamin C 

High amounts of vitamin C can be found in the aqueous humor of the eye, the liquid that fills the eye’s anterior chamber and supports corneal integrity. This has prompted scientists to consider this vitamin’s role in protecting eye health. 

Research suggests that regularly taking vitamin C (along with other essential vitamins and minerals) can lower the risk of developing cataracts, and slow the progression of age-related macular degeneration and visual acuity loss.

While vitamin C appears to support eye health in a variety of ways, it’s still unclear whether taking this supplement benefits those who aren’t deficient. Vitamin C can be found in various fruits and vegetables, like bell peppers, tomatoes, citrus fruits, broccoli, and kale. 

Vitamin E

Vitamin E is an antioxidant that helps protect fatty acids from becoming oxidized. Because the retina has a high concentration of fatty acids, sufficient vitamin E intake is crucial for optimal ocular health. 

Vitamin E can be found in almonds, flaxseed oil, and sunflower seeds. 

Zinc

Healthy eyes naturally contain high levels of zinc. A zinc deficiency can cause night blindness, and thus increasing zinc intake can improve night vision. Zinc also helps absorb Vitamin A, an essential antioxidant. 

Make sure to avoid taking high doses of zinc (beyond 100 mg daily) without first consulting your eye doctor. Higher doses of zinc have been associated with side effects such as reduced immune function. You can increase your zinc intake naturally by consuming more oysters, meat, and peanuts. 

Phytochemical Antioxidants

Phytochemical antioxidants are chemicals produced by plants that contain several health benefits. Some studies show that these plant-based chemicals may enhance vision and eye health as well as prevent age-related eye diseases and complications by alleviating ocular oxidative stress. Oxidative stress within the eyes contributes to several eye conditions, including  dry eye syndrome. Consuming more produce with these antioxidants can help balance the anti-oxidant and pro-oxidant system, resulting in healthier eyes. 

Personalized Eye Nutrition 

If you or someone you know is looking for ways to boost or maintain eye health, speak with an optometrist near you about what supplements and vitamins are best for you. For an eye doctor in Las Vegas, give us a call at 702-254-6222.

 

12 Tips for Optimal Eye Health

Good Eye Care Habits & Hygiene

By practicing good eye care habits and hygiene, you can prevent many vision problems from occurring. Eye problems and the risks associated with vision loss only grow as you age. By neglecting eye care, you place yourself at a higher risk of suffering from cataracts, macular degeneration, glaucoma, diabetic retinopathy, and low vision.

So make sure you maintain great eye health by following these 12 tips for optimal eye health.  

1. Avoid rubbing your eyes

Itchy eyes can be a hallmark symptom of allergies, and though rubbing may bring temporary relief, it ultimately increases swelling and worsens the itch. If you wear contact lenses, rubbing your eyes can also dislodge or even break a lens, causing the lens to get lost or scratch the cornea. Plus, eye rubbing can lead to eye infections, since our hands are typically covered with a host of germs.

2. Regularly wash your hands

Conjunctivitis (pink eye) is often caused by germs and bacteria carried to your eyes by unclean hands. Frequently washing your hands with soap and warm water helps keep bacteria away and prevents eye contamination. Prior to inserting or removing contact lenses, make sure to wash your hands with mild soap and dry them using a lint-free towel. 

3. Beware of UV rays

By exposing yourself to sunlight and UV rays, you increase the risk of developing macular degeneration and corneal sunburn. Beyond just adding some style and zest to your look, sunglasses should protect your eyes from dangerous UV rays. Speak to your optometrist about the different options available for people who wear prescription eyeglasses or contact lenses too, to keep your eyes safe in the sun.

4. Stay hydrated

Staying hydrated is crucial for your body’s overall health and wellbeing — and that includes your eyes. Among other complications, if you don’t have enough fluid in your body, it impacts tear production and can cause dry eyes and irritation. Drink up!  

5. Don’t smoke cigarettes

Need some extra motivation to quit smoking? 

Smokers are more prone to developing age-related macular degeneration, cataracts, and other eye conditions. Cigarette smoking can also destroy optic nerves, which can adversely affect your vision over time. So think twice before you light up, and speak to your doctor about getting help to quit. 

6. Eat a healthy diet

Eat plenty of fruits and vegetables to ensure that your diet is rich in antioxidants, such as Vitamins A and C. These can be found in leafy greens (your mom was right about spinach!), orange vegetables (think, carrots and sweet potato) and citrus fruit. Furthermore, fatty fish like salmon contain essential omega-3 fatty acids which also promote excellent eye health. 

7. Keep a healthy distance from screens

Nip digital eye strain in the bud by positioning your computer monitor about an arm’s length away from the eyes and 20 degrees below eye level. Ideally, work in a room with enough diffused lighting to reduce stress on your eyes from the computer light.

8. Remember the 20-20-20 rule 

Speaking of computers, have you heard of the 20-20-20 rule? When using digital devices, rest your eyes every 20 minutes by looking 20 feet away for 20 continuous seconds. 

Once you’re at it, blink 20 times in succession to prevent dry eyes, and make it a habit to rise from your seat and take 20 steps to promote good posture and blood circulation, which helps your vision too.  

9. Be careful with eye make-up 

Make sure that your eye shadow, mascara, and eyeliner don’t cause your eyes an allergic reaction. Get in the habit of removing your make-up before going to sleep in order to avoid bacterial build-up from residual make-up left in the eye area. And, from time to time, clean your make-up brushes, especially those used to apply cosmetics around the eye area.

10. Sleep is golden

Just as with the rest of your body, your eyes need a break. So make sure that you get sufficient shut-eye (8 hours) each night to keep your eyes revitalized and healthy.

11. Wear protective eyewear 

Whatever you do, make sure your eyes are well-protected. If you’re swimming, wear goggles to prevent chlorine from entering your eyes. If you’re gardening or engaged in a DIY project at home, wear safety glasses to keep dust particles and bacteria at bay and prevent eye injuries. Ask your local eye doctor about protective eyewear for sports and other activities.

12. Regularly visit your eye doctor

Don’t underestimate the importance of getting a routine eye exam, whether you need an updated prescription or not. Even if you can see well today, a comprehensive eye exam can pick up early signs of eye diseases and conditions before symptoms become noticeable, such as glaucoma, diabetes, retinal holes which could lead to retinal detachment, and cancers like melanoma. Early detection and management can prevent further complications and serious vision loss down the line.

Only an eye doctor has the required knowledge, experience, tools and techniques to determine whether you have these or other eye conditions.

It is recommended that everyone gets a comprehensive eye exam once a year (or at least every two years). Children, whose eyes are rapidly developing, and people at higher risk for developing eye problems such as diabetics and older people, need to undergo eye exams even more frequently: at the minimum, yearly. 

During the evaluation, the eye doctor will check for things like: 

  • Farsightedness, nearsightedness, astigmatism and/or presbyopia
  • Eye coordination 
  • Optic nerve and eye pressure tests to spot glaucoma

It’s also important to be on the look-out for any changes in your vision. If you experience hazy or double vision, worsening eyesight, red eyes, eye pain, swelling or floaters, contact Dr. Christopher Chiodo, OD.  

Incorporate these tips and habits into your lifestyle to maintain healthy eyes and a high quality of life. The Vision Centers offers comprehensive eye exams in Las Vegas, Nevada , and will be happy to answer any questions you may have about ways to maintain healthy vision.