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Eyesight - Looking at the Stars (in the night sky)
Posted on 12/7/18 at 8:55 pm
Posted on 12/7/18 at 8:55 pm
So, I just noticed, while looking at a constellation, possibly the little dipper, it was very bright when I wasn't looking directly at it. When I focused directly on it, it faded away and almost disappeared. I know I am losing my near-sight vision, like reading instructions to anything and holding them further. But my far-sightedness is great (I sound old as frick 
) So why are stars disappearing?
) So why are stars disappearing? 
17
Posted on 12/7/18 at 8:57 pm to liz18lsu
Posted on 12/7/18 at 8:58 pm to liz18lsu
Sometimes I think that is caused from damage to your retina.
Do you see stars when you cough really hard while tired?
Do you see stars when you cough really hard while tired?
Posted on 12/7/18 at 8:58 pm to liz18lsu
quote:
So why are stars disappearing?
A lot of them are projections. I don’t remember if the Little Dipper was on the last list I saw but I’ll check. That could explain your experience.
Posted on 12/7/18 at 8:59 pm to liz18lsu
Shut your eyes, count to thirty aND then reopen. Will help night vision.
Posted on 12/7/18 at 9:00 pm to BHM
Aids.
Posted on 12/7/18 at 9:01 pm to liz18lsu
That is a normal phenomenon. Don't look directly at it.
Posted on 12/7/18 at 9:01 pm to BHM
quote:Probably more like the actual macula area which because it is a nerve connection contains no rods or cones to receive input, thus a blind spot. Just off center rear of each eye. So seeing out to one side causes one eye to be blind to the input cutting perception in half.
Macular degeneration.
Posted on 12/7/18 at 9:06 pm to Pectus
quote:
That is a normal phenomenon. Don't look directly at it.
This.
Looking directly at it focuses light not on rods and cones, which register incoming photons, but where the optic nerve joins the eyeball (no photon detectors there).
Something like that anyhow.
Posted on 12/7/18 at 9:08 pm to liz18lsu
quote:
So, I just noticed, while looking at a constellation, possibly the little dipper, it was very bright when I wasn't looking directly at it. When I focused directly on it, it faded away and almost disappeared. I know I am losing my near-sight vision, like reading instructions to anything and holding them further. But my far-sightedness is great (I sound old as frick ) So why are stars disappearing?
It is totally normal, our peripheral vision is much more sensitive at night because the rods that make up the periphery of the retina are 1000 times more sensitive to light than the cones clustered in the center, but rods only respond to black and white, so the effect is more noticeable at night.
LINK
"In dim light, when it’s nighttime and dark, the cones are fairly useless. The rods are present at the extremes of the eye. That’s why we can better pick up objects by averting our glance rather than viewing the object directly. As a matter of fact, hunter safety courses and military trainers say not to look directly at an object at night if you want to see it. Peer or scan around the object you are trying to see so that the light falls on the rods"
This post was edited on 12/7/18 at 9:12 pm
Posted on 12/7/18 at 9:08 pm to Sidicous
quote:
Probably more like the actual macula area which because it is a nerve connection contains no rods or cones to receive input, thus a blind spot. Just off center rear of each eye. So seeing out to one side causes one eye to be blind to the input cutting perception in half.
Posted on 12/7/18 at 9:08 pm to liz18lsu
Depending on the angle a stars light enters the atmosphere, you get distortion. During certain times of the year, certain stars are red because of this.
Posted on 12/7/18 at 9:10 pm to Sidicous
I've always noticed this. The stars appear clearer as I focus slightly away.
Posted on 12/7/18 at 9:10 pm to liz18lsu
I cant even see stars anymore. When I look up I see just a black background with random fuzzy pinpointed white things moving around everywhere.
Posted on 12/7/18 at 9:11 pm to liz18lsu
A quick review on how the eye works. Light passes through the outer layer of the eye called the cornea, goes through a clear liquid solution termed the aqueous humor, then the pupil, or the black hole of the eye and then strikes the lens. The cornea and lens bend or refract light. The light passes through the eyeball filled with a liquid (vitreous humor) and then strikes the retina.
The image is formed on the retina in the back of the eye. The retina is like the film in a camera. This is where seeing takes place. There are two types of receptors that make up the retina: rods and cones. Cones are found near the center of the retina and detect color. An easy way to remember is to use the three Cs: center, cones, color.
The rods are found on the edges or periphery of the retina. Rods are 1,000 times more sensitive to light, but they do not respond to color. Rods are far more numerous. A typical set of eyes has six million cones and 120 million rods.
Most all of our vision makes use of the densely packed cones in that center part of the eye, called the fovea. That fovea gives us color and fine detail.
In dim light, when it’s nighttime and dark, the cones are fairly useless. The rods are present at the extremes of the eye. That’s why we can better pick up objects by averting our glance rather than viewing the object directly. As a matter of fact, hunter safety courses and military trainers say not to look directly at an object at night if you want to see it. Peer or scan around the object you are trying to see so that the light falls on the rods.
The image is formed on the retina in the back of the eye. The retina is like the film in a camera. This is where seeing takes place. There are two types of receptors that make up the retina: rods and cones. Cones are found near the center of the retina and detect color. An easy way to remember is to use the three Cs: center, cones, color.
The rods are found on the edges or periphery of the retina. Rods are 1,000 times more sensitive to light, but they do not respond to color. Rods are far more numerous. A typical set of eyes has six million cones and 120 million rods.
Most all of our vision makes use of the densely packed cones in that center part of the eye, called the fovea. That fovea gives us color and fine detail.
In dim light, when it’s nighttime and dark, the cones are fairly useless. The rods are present at the extremes of the eye. That’s why we can better pick up objects by averting our glance rather than viewing the object directly. As a matter of fact, hunter safety courses and military trainers say not to look directly at an object at night if you want to see it. Peer or scan around the object you are trying to see so that the light falls on the rods.
Posted on 12/7/18 at 9:11 pm to liz18lsu
Rods and Cones!!!
The center of your eye is better for vision with light present. At night, the outer portion of your eye takes over.
The center of your eye is better for vision with light present. At night, the outer portion of your eye takes over.
Posted on 12/7/18 at 9:11 pm to EA6B
Cones are more for fine vision and used in bright light. Your central vision (the macula) is nearly all cones. Rods are more active in dim light, rods are most concentrated at about 20deg from your central fixation
This post was edited on 12/7/18 at 9:15 pm
Posted on 12/7/18 at 9:12 pm to Rouge
quote:
In dim light, when it’s nighttime and dark, the cones are fairly useless. The rods are present at the extremes of the eye. That’s why we can better pick up objects by averting our glance rather than viewing the object directly. As a matter of fact, hunter safety courses and military trainers say not to look directly at an object at night if you want to see it. Peer or scan around the object you are trying to see so that the light falls on the rods.
You stole my link.
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