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> Aging Eyes
Aging Eyes
@ 02:08 am (GMT) |
David LandwehrSo I'm in my mid fifties. I've been having to correct dioptre more often in the last couple of years.What I've recently noticed is when I zoom my side focus to best sight picture my parralax is significantly out. Significantly. I noticed by trouble shooting my poor groups in otherwise previously accurate rifles. If I zoom for paralax my sight picture is very unfocused. This is both with a Sightron SIII and a much cheaper Hawke scope amongst others. So I guess I'd like to know if this is common with aging eyes. Do I need to start to shoot wearing glasses and adjust the dioptre with glasses on. Then will the focused target picture be paralax correct. Thanks. |
Replies
@ 05:23 am (GMT) |
Daniel SchindlerRe: Aging EyesHi David.Pls forgive my not answering your very clear question. What brought me to your post was the Subject you wrote. I'm a firm believer in "preventive maintenance." May I respectfully suggest making sure you are taking quality types of eye vitamins. I take mine daily. My "older" shooting buddies are doing the same. Doing so is definitely helping preserve what good vision each of us have left. I'm 77 and still (thankfully) holding onto 20/20 vision. Not my intent to sidetrack your good question David. Just a quick FWIW. Cheers. Dan |
@ 07:09 am (GMT) |
Nathan FosterRe: Aging EyesHi David, I am also a firm believer in preventative maintenance.Will speak on this briefly and leave you to study evidence and experiment for yourself. If you have not heard of the Bates method of maintaining natural vision, please look into this. Note that modern science generally disagrees with the Bates method, that was until just recently. The following article takes us full circle, back to Bates sunning method - but also refines it thanks to advances in scientific understanding. I would advise all of my readers to study the article and to consider its conclusions. Cut and paste: Morning exposure to deep red light improves declining eyesight Date: November 24, 2021 Source: University College London Summary: Just three minutes of exposure to deep red light once a week, when delivered in the morning, can significantly improve declining eyesight, finds a pioneering new study by UCL researchers. Published in Scientific Reports, the study builds on the team's previous work*, which showed daily three-minute exposure to longwave deep red light 'switched on' energy producing mitochondria cells in the human retina, helping boost naturally declining vision. For this latest study, scientists wanted to establish what effect a single three-minute exposure would have, while also using much lower energy levels than their previous studies. Furthermore, building on separate UCL research in flies** that found mitochondria display 'shifting workloads' depending on the time of day, the team compared morning exposure to afternoon exposure. In summary, researchers found there was, on average, a 17% improvement in participants' colour contrast vision when exposed to three minutes of 670 nanometre (long wavelength) deep red light in the morning and the effects of this single exposure lasted for at least a week. However, when the same test was conducted in the afternoon, no improvement was seen. Scientists say the benefits of deep red light, highlighted by the findings, mark a breakthrough for eye health and should lead to affordable home-based eye therapies, helping the millions of people globally with naturally declining vision. Lead author, Professor Glen Jeffery (UCL Institute of Ophthalmology), said: "We demonstrate that one single exposure to long wave deep red light in the morning can significantly improve declining vision, which is a major health and wellbeing issue, affecting millions of people globally. "This simple intervention applied at the population level would significantly impact on quality of life as people age and would likely result in reduced social costs that arise from problems associated with reduced vision." Naturally declining vision and mitochondria ________________________________________ In humans around 40 years old, cells in the eye's retina begin to age, and the pace of this ageing is caused, in part, when the cell's mitochondria, whose role is to produce energy (known as ATP) and boost cell function, also start to decline. Mitochondrial density is greatest in the retina's photoreceptor cells, which have high energy demands. As a result, the retina ages faster than other organs, with a 70% ATP reduction over life, causing a significant decline in photoreceptor function as they lack the energy to perform their normal role. In studying the effects of deep red light in humans, researchers built on their previous findings in mice, bumblebees and fruit flies, which all found significant improvements in the function of the retina's photoreceptors when their eyes were exposed to 670 nanometre (long wavelength) deep red light. "Mitochondria have specific sensitivities to long wavelength light influencing their performance: longer wavelengths spanning 650 to 900nm improve mitochondrial performance to increase energy production," said Professor Jeffery. Morning and afternoon studies The retina's photoreceptor population is formed of cones, which mediate colour vision, and rods, which adapt vision in low/dim light. This study focused on cones*** and observed colour contrast sensitivity, along the protan axis (measuring red-green contrast) and the tritan axis (blue-yellow). ________________________________________ All the participants were aged between 34 and 70, had no ocular disease, completed a questionnaire regarding eye health prior to testing, and had normal colour vision (cone function). This was assessed using a 'Chroma Test': identifying coloured letters that had very low contrast and appeared increasingly blurred, a process called colour contrast. Using a provided LED device all 20 participants (13 female and 7 male) were exposed to three minutes of 670nm deep red light in the morning between 8am and 9am. Their colour vision was then tested again three hours post exposure and 10 of the participants were also tested one week post exposure. On average there was a 'significant' 17% improvement in colour vision, which lasted a week in tested participants; in some older participants there was a 20% improvement, also lasting a week. A few months on from the first test (ensuring any positive effects of the deep red light had been 'washed out') six (three female, three male) of the 20 participants, carried out the same test in the afternoon, between 12pm to 1pm. When participants then had their colour vision tested again, it showed zero improvement. Professor Jeffery said: "Using a simple LED device once a week, recharges the energy system that has declined in the retina cells, rather like re-charging a battery. "And morning exposure is absolutely key to achieving improvements in declining vision: as we have previously seen in flies, mitochondria have shifting work patterns and do not respond in the same way to light in the afternoon -- this study confirms this." For this study the light energy emitted by the LED torch was just 8mW/cm2, rather than 40mW/cm2, which they had previously used. This has the effect of dimming the light but does not affect the wavelength. While both energy levels are perfectly safe for the human eye, reducing the energy further is an additional benefit. Home-based affordable eye therapies With a paucity of affordable deep red-light eye-therapies available, Professor Jeffery has been working for no commercial gain with Planet Lighting UK, a small company in Wales and others, with the aim of producing 670nm infra-red eye ware at an affordable cost, in contrast to some other LED devices designed to improve vision available in the US for over $20,000. "The technology is simple and very safe; the energy delivered by 670nm long wave light is not that much greater than that found in natural environmental light," Professor Jeffery said. "Given its simplicity, I am confident an easy-to-use device can be made available at an affordable cost to the general public. "In the near future, a once a week three-minute exposure to deep red light could be done while making a coffee, or on the commute listening to a podcast, and such a simple addition could transform eye care and vision around the world." End. Hunters will no doubt see the irony in all of this. Were we still hunter gatherers, we would be exposed to higher levels of morning sun. This modern computer age involving long periods of fixed focusing seems to be the absolute anti of good eye health. As I keep saying in the books - use technology to your advantage, don't let it use (or abuse) you. I am just now trialing the red light glasses developed in the above study (to help offset time spent writing books etc). But as yet (week 2), I have nothing to report. https://www.eye-power.co.uk/product/eyepower-red/ |
@ 10:36 am (GMT) |
Warwick MarflittRe: Aging EyesHey Nathan.... how about getting up early and watching the Red sky before sun rise ? Nothing too loose except some sleep.... through out history men n women have been up before dawn to get things done. Its only been 150 odd years that man has sacrificed a natural environment for artifically adjusted surroundings... The effects of which, my non vaxed status disqualifies my opinions valliditty..... If it was It wood bee that Natural is usual and whats usually natural is valid and good... get up and catch the Red eye sky. |
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@ 10:47 am (GMT) |
Warwick MarflittRe: Aging EyesDavid. Experiment. I have written about my eyes and difficulty with open sights .I adjusted my scopes to suite my eyes.... the down side being that no one else can see clearly thru my scopes.... have you set up you eye relief distance? Have a systematic go at adjusting all perameters one at a time to see if you can get a clear picture of things... |
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