Tears are best known as an expression of emotion, both happy and sad, but as a fluid secreted by the body, tears contain specific proteins that can be early indicators, or biomarkers, of systemic disease in other body parts. Researchers have found biomarkers in tears for diabetes, cancer, multiple sclerosis, Alzheimer’s, and Parkinson’s diseases. A study published earlier this year by Multidisciplinary Digital Publishing Institute (MDPI), Tears as the Next Diagnostic Biofluid: A Comparative Study between Ocular Fluid and Blood, compared proteins found in blood plasma with those found in tears.
A research study published in Frontiers in Human Neuroscience revealed more about the eye-brain connection. Fifty subjects viewed optical illusions that evoked the perception of an expanding black hole, as compared to those that appeared in a previous study as an increase in brightness and tracked pupillary responses. (Front. Hum. Neurosci., 30 May 2022 Sec.Sensory Neuroscience, https://doi.org/10.3389/fnhum.2022.877249)
Of the suite of currently available myopia management strategies, spectacles present a convenient and minimally intrusive option, especially for children under 12 years of age. Novel spectacle designs comprising D.I.M.S., H.A.L.T., and D.O.T. technology slow myopia. They are a significant value-add to myopia management options, as they can be easily fitted even in young children and require minimal care.
May 22 has been celebrated as Sherlock Holmes Day, honoring the birthday of Sir Arthur Conan Doyle, author of the Holmes mysteries, but did you know that Sir Arthur was an ophthalmologist? From Holmes’ use of a magnifying glass and microscope to the appearance of a scalpel used for cataract surgery discovered as a clue in one story, Sir Arthur’s ophthalmology background seems to have had a profound influence on the famous fictional detective’s crime-solving ability.
There it is again, that little speck that glides across my vision from time to time, then disappears. There are times when I’m looking at the sky or a blank wall and notice little shapes floating in front of me. They’re not quite clear — almost like little bits of dust stuck on a camera lens. I try to blink them away, but they’re still there. When I look somewhere else, these shapes move with me. Mostly, it’s an annoyance and distraction, but sometimes it’s briefly entertaining to try to follow their path. But what are they, and where did they come from?
Major League Baseball is back, and so is the 100-mph fastball. How is a batter able to hit a ball traveling faster than the eye’s ability to track it? The answer lies with the retina’s ability to signal the brain to anticipate the future, or predictive motion encoding.
Machines such as cars and robots don’t have eyes, but we expect them to “see.” How can that happen? Researchers are applying what has been learned from decades of perfecting eye-imaging technologies to tomorrow’s autonomous systems sensor technologies, such as those found in self-driving cars. Let’s start with cars. Today’s self-driving cars use a combination of three sensor and image technologies: radar, Light Imaging Detection and Ranging (LIDAR) , and cameras.
We’ve all experienced the feeling of someone looking at us, even if we don’t see them. A look over the shoulder or a turn of the head, and sure enough, there they are. Hopefully, the look is with admiration for our stunning eyewear or new outfit. But how did we know we were being watched? Scientists are finding evidence that it’s another feature of the eye-brain connection, rather than just a feeling.
You don’t look like you feel well. How often has this statement been a precursor to some medical intervention? What exactly are people seeing that triggers this question? How physicians, especially, discern differential skin pigmentation in patients casts an intriguing glimpse into the physical development of color perception in the human eye as well as possible avenues for advanced medical training.
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