Questions tagged [ophthalmology]
Ophthalmology is the branch of medicine dealing with the diagnosis, treatment and prevention of diseases of the eye and visual system.
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How can the human eye be tricked into keeping the lense relaxed?
I'm a computer programmer trying to work on a personal hobby project that uses lenses to focus a very close display for the eye (designed to fit into a headset similar to VR).
I am under the ...
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Is it medically advisable to have spectacle lenses perfectly aligned with each other?
I have noticed some local brands of spectacles having the lenses slightly angled as shown in the second image below ("If lenses are at an angle"). I believe it is done to have the lenses ...
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What are the types of retinal Optical Coherence Tomography (OCT), and what does a healthy/normal retina look like in each imaging technique?
Can there be variations in the curvature of the fovea and macula of healthy retinas?
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Is iris shadow present in nornal eye?
As in immature cataract, there is lenticular opacity but there is an existing gap between the iris and anterior capsule of lens, hence iris shadow is casted owing to the underlying opacity that offers ...
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Health advantage of refractive surgery against shortsightedness and astigmatism?
As far as I understand, refractive surgery (eye laser surgery, intraocular lens) for fixing medium shortsightedness and astigmatism is only for comfort, because after the surgery you can probably see ...
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macular insult during optic neuritis
In our lecture today, the professor gave us a trick question: although papilledema and most optic nerve/disc pathology cause either generalized visual field depression or visual field defects, sparing ...
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Why do optometrists recommend dilation when the power of a lens can be measured even by a ruler?
I don't understand why optometrists dilate your eyes, which is a very annoying thing, when eye power can be measured by just a ruler at your home as suggested by this, which just uses a 100/(distance ...
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Is the common saying that sitting close to a screen regularly can cause short-sightednes backed by medical science?
How true is this? Should I be cautious as I spend too much time in front of a laptop screen? I already have glasses with power 0.5 and 0.25, ( this was 3 years ago, I haven't tested recently) but I ...
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Detrimental effects of very-wide or multiple monitors?
Over the past several decades, computer monitors have typically gotten larger, and more specifically wider. Also, it has become (somewhat) more common for people to use an multiple monitors next to ...
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Do temporary IOP elevations doing activities involving Valsalva maneuver result in glaucomatous damage to the optic nerve?
Some studies examined the effect of Valsalva maneuver on intraocular pressure with most of them stating a temporary but significant increase (see studies linked 1, 2, 3, 4).
Activities that may ...
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Does a high-carbohydrate and sugar diet induce or worsen myopia in kids?
I have found this article: https://www.bmj.com/rapid-response/2011/10/29/myopia-possible-link-increased-refined-carbohydrate-intake-and-hyperinsuli
which by no means is a hard evidence by itself but ...
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Are there any verified cases of patients that stopped wearing prescription glasses due to a spontaneous remission of a visual impairment?
I would like to know if there are medically verified records of individuals prescribed with eyeglasses for years, who eventually experienced a spontaneous remission of their visual impairments, ...
user20368
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Why do the eyes need to be closed during sleep to regain moisture?
I've noticed that if I don't sleep for a long time, my eyes get dry, and no amount of moisture helps to moisturize them. I moisturize every 10 minutes and it doesn't help. The answer is sleep. Our ...
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Can watching lightning be dangerous for one's eyesight (assuming not directly or indirectly hit by the lightning strike)?
Watching the sun can cause eye damage. Can watching lightning be dangerous for one's eyesight (assuming not directly or indirectly hit by the lightning strike)?
The only study I have found so far, {...
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Rationale for Pilocarpine instillation after retrobulbar haemorrhage
BACKGROUND: Retrobulbar haemorrhage may occur due to retrobulbar block. Immediate pressure bandage after instilling one drop of 2% pilocarpine and postpone of operation for a week is advised.
What is ...
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What is the function of the collagen fibres in the vitreous body of the human eye?
The vitreous body of the human eye consists of mostly water, but there is also a small percentage of collagen fibres.
What is the function of these fibers?
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Which nerve inflammation can affect vision other than the optical nerve itself?
Which nerve inflammation can affect vision other than the optical nerve itself?
Can a nerve inflammation affect vision?
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Is there a convenient self test for Glaucoma?
I was identified as a glaucoma suspect and told to get rechecked for glaucoma annually. Knowing that glaucoma can move more quickly than that I was spooked and wound up creating my own self test. If ...
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How to reduce the side effects of wearing contact lens? [closed]
This explains a lot of side effect of wearing contact lens. The type of contact lens Iam talking about is silicon hydrogel lenses.
Questions:
1) Till how many hours can lens be worn continuously?
2)...
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Is "voluntary accommodation" common?
I can't find any resource online about what I call "voluntary accommodation": the ability to contract the lens of the eye manually in order to blur or clear the vision. My optician advised me to ask a ...
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My left and right eye have a consistent, clear difference in color perception. Why?
Myself, my brother, and a friend of mine all have noticed independently that our left and right eyes perceive colour differently from the other eye. As compared to my vision with both eyes open, my ...
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How many times in a lifetime a man can do laser vision/eyesight correction/surgery?
Is it true that laser vision/eyesight correction/surgery is strictly recommended to do only once in a lifetime and if after first laser correction someone's eyesight returned to bad condition the only ...
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why is it not allowed to take aspirin based medicines before a day and after a week of cataract surgery?
my mom had a cataract surgery she used to take daily dosage of UNISTAR 75 which contains aspirin in it but doctor said not to take it for a week. what is the reason behind it ?
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For painting/drawing models, what is the maximum exposure time and maximum light intensity of a spot shining in your eyes at a fixed position?
For painting/drawing models, what is the maximum exposure time and maximum light intensity of a spot shining in your eyes at a fixed position?
That is: before the damage to your eyes becomes ...
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Why can not Myelin sheath be fully rebuilt?
I've joined a group on Facebook. It's about people that have optic neuritis. After recovery, The affected eye is back to its original state. There's always a very very small deficiency in the eyesight....
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Safe and state-of-the art method of laser vision/eyesight correction/surgery?
I have defective vision, particularly shortsightedness. Obviously, it is quite widespread phenomenon. I tried several times to get accustomed to contact lenses, but without success. It irritates my ...
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Is the blue light emitted by computer monitors deleterious for the human eyes?
Is the blue light emitted by computer monitors deleterious for the human eyes? By deleterious, I mean irreversible damage.
I read some conflicting information:
http://www.drweil.com/health-wellness/...
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What effects would aspheric contact lenses have on eyes without astigmatism?
Aspheric lenses are used for treatment of astigmatism. I am curious what effects might happen if they were used by someone without an astigmatism.
What effects would it have on visual acuity?
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What is the angular resolution of the 'ideal' human eye?
The visual acuity page on wikipedia suggests 1.8 arcmin @ 1km away (but says nothing about the relationship expected between distance and angular resolution) whilst the page on angular resolution ...
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Proper treatment of Chalazion draining [closed]
I have had a Chalazion on my left upper eyelid for about a month now. It had been growing larger, and recently started to form a white head.
I get styes and chalazions fairly frequently, but never ...
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Can aberrometric contact lens correct night halo after a PRK?
The PRK myopia operation has corrected a strong myopic defect (9 degree) in an optical zone of 6mm of diameter. But the pupil is larger than this treated zone on the cornea.
This means that the ...
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What causes optical floaters to be more or less visible?
When I first started getting floaters in my eyes (several years ago), my opthalmologist told me that they don't go away but over time your brain learns to ignore them/filter them out. This seems to ...
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Astigmatism eyeglass lenses -- how much distortion is normal?
I've been wearing glasses for near-sightedness for almost my entire life but only yesterday got glasses to correct my astigmatism. The world now looks rather distorted. To name two examples, my ...
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Vision - is Bates method really able to restore one's vision?
Recently I learned about the Bates method but it looks kinda fantasy for me (don't want to offend anyone). Are there people who followed these guides and succeeded in restoring (at least partially) ...
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When someone with glaucoma sees rainbows around lights, what exactly is happening physically?
People with open-angle glaucoma sometimes see halos or rainbows around bright lights (e.g. headlights at night), but not always. Glaucoma results in elevated intraocular pressure and thence pressure ...
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Long-term effects of lens removal as the vitreous ages?
In a case of pediatric cataract surgery where the lens was not replaced, there is no lens to serve as a barrier between the aqueous and the vitreous. I once asked an ophthalmologist what keeps them ...
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How safe are contact lenses?
Are there any side effects to wearing contact lenses for a long time? Is there any way that wearing them can damage your eyes?
I'm referring to long-term use that is within or close to the ...
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Outcomes and risks of LASIK surgery
If an individual with poor eyesight undergoes LASIK surgery, will it return the sight exactly to normal? What are the risks of the procedure? Are there any side effects or complications to be ...
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Naturally improve eyesight [closed]
Is there a possibility to improve the deteriorating eyesight naturally? If yes, how is it possible? If the eye sight continues to get worse, is there a chance of losing eyesight completely?
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Can electronic device help with glaucoma? [closed]
Retinal implants have been used in retinitis pigmentosa to restore some vision when the optic nerve is still intact, and experimental cortical implants when the optic nerve is damaged.
Are these ...
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Will eye floaters ever disappear?
According to wikipedia on eye floaters:
Floaters are often caused by the normal aging process and will usually disappear as the brain learns to ignore them.
Even if this might be the case for very ...
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