Unraveling the mystery of human crying

Eye care
Written By Lucinda Howard
Why we cry

I love a film that makes me cry or even watching a great sports performance can get the tears rolling (ice skating currently seems to have me dabbing at my eyes). Have you ever wondered why water comes from our eyes when we’re sad or tired or frustrated? Interestingly crying (or lacrimation) is one of the most unique and perplexing of human behaviours and it is the only physiological function that is unique to humans. The physical consistency of tears themselves is also complex. There are three different kinds. But what is the purpose of turning on the waterworks? It all depends on what caused them.


There are three types of tears. Basal, reflex and emotional.

Basal tears:

Basal tears are the ones in our eyes all the time that serve to protect, nourish and lubricate the eyes. These tears are chemically different from other types of tears.

  • Constantly produced

  • Keep dirt and debris away

  • Made up of three layers: mucus layer which keeps tears fastened to the eye, an aqueous layer which keeps in hydration and keeps out invasive bacteria, and an outer lipid layer which keeps the surface smooth.

Reflex tears:

Reflex tears appear in large quantities to protect the eye from irritants such as wind, smoke, or the chemical “syn-propanethial-S-oxide” in onions.

  • Wash away harmful substances

  • Released in large amounts

  • The aqueous layer contains antibodies to stop microorganisms


Emotional tears:

Emotional tears are unique to humans and are the most mysterious kind of tears. Scientists don’t know exactly why we emotionally cry but there are various theories. One theory according to a study out of Vassar College suggests tears developed as a silent signalling system to let others respond to us when we are vulnerable without alerting predators. Others believe it’s a way to elicit compassion. There’s also the argument that a good cry alleviates stress - 85% of women and 73% of men report feeling better afterwards. Lastly, there’s the possibility that tears help build strong communities by eliciting empathy and therefore closer relationships necessary to living in a complex society.

  • Stabilize mood

  • Contain high levels of stress hormone ACTH

  • Contain encephalin–an endorphin and natural painkiller

Now the next time you’re watching the John Lewis advert, you will know that your eyes are welling up for a purpose and can reflect on how the tears are an example of the incredibly intricate systems that go into making us humans who we are.

I hope this blog post has been of interest and I look forward to welcoming you in practice again soon.

Lucinda

Discover our other eye care blogs

Blog
The Importance of Regular Eye Exams for Optimal Vision Health
The Importance of Regular Eye Exams for Optimal Vision Health

Regular eye exams are not just about updating your prescription; they are crucial for maintaining optimal vision health. At Arthur Hayes Opticians, we understand the significance of comprehensive eye tests and utilise the latest technology to ensure your eyes receive the care they deserve. Our exams are designed to be comfortable and convenient, ensuring you feel at ease throughout the process.

Read More →
Understanding Macular Degeneration: A Guide to Age-Related Vision Changes
Understanding Macular Degeneration: A Guide to Age-Related Vision Changes

Macular degeneration, also known as age-related macular degeneration (AMD), is a common eye condition that affects the macula, a small area near the centre of the retina at the back of the eye. The macula is responsible for sharp, central vision, which is necessary for activities like reading, recognizing faces, and driving.

Read More →
Adaptive Vision: Unveiling the Wonders of Photochromic Lenses
Adaptive Vision: Unveiling the Wonders of Photochromic Lenses

Photochromic lenses, also known as transition lenses, are a type of spectacle lens that can automatically adjust their level of darkness or tint in response to changing lighting conditions. These lenses contain special photochromic compounds that react to ultraviolet (UV) light. When exposed to UV radiation, such as sunlight, the lenses darken, providing sun protection and reducing glare. When the UV light diminishes, the lenses gradually return to their clear state.

Read More →
Lucinda Howard
Previous

The Next Exciting Step in Eye Care - Optomap
Next

Ready readers vs prescription lenses