the thing that i do not understand is that the Cranial Nerve that carrys light sensory information is the optic nerve, then, how does the trigeminal nerve get stimulated by light? I understand that the Ophthalmic branch of V1 provides sensory innervation the skin of the upper face, cornea and meninges, but none of them have special structures--like the retina of the IICN--that translates photons into action potentials. Maybe the iris contraction in response to light triggers the mechanoreceptors in the iris, providing a sensory component to V1? thanks for the video, very helpful all the same
Sensation, in the sense of sensation like pain pressure touch vibration etc for the eye in total is trigeminal nerve. Visual sensation is the optic nerve
@@ahmedjaved3907 yes, I agree on that. but light does not triger vibration, or touch receptors--unless it heats nocireceptors--but photophobia is even to dim light so I do not think these receptors (vibration, touch, heat/cold) are responsible for photophobia.
@@jesuslima4380 Perhaps this review article (www.ncbi.nlm.nih.gov/pmc/articles/PMC3485070/) will shed some light on this? Puns notwithstanding, it seems that there is a light-evoked nociceptive discharge in V1 neurons that can be blocked with lidocaine, found in Okamoto et al. However, a separate paper also found an entirely separate group of retinal ganglion cells that synapse in thalamic centers not traditionally associated with vision and more linked to pain sensation.
It is the ABRUPT change of light, not light itself. I have very unique vision, I can see fine in all kinds of light. But someone turns on the light switch thinking they're helping me, and it causes a spasm. I've gone from right eye dominant to left eye dominant. The acuity of my eye is strained. I've tried explaining this to my friends and loved ones. Just say "light". It gives me a second to prepare for the change. Few people respect this and I isolate a lot. For whatever reason it can cause me intense pain very briefly. But it hurts like hell.
Thank you. I have chronic photophobia, and find that dopaminergic drugs (Adderall, Wellbutrin) and also ice bathing improve the symptoms. Do you think my photophobia might be caused by low levels of dopamine / norepinephrine? Thanks
I suffer from chronic photophobia, had a pineal gland cyst resection about 2 years ago - figured it was tied to some disruption in the thalamus, would love to learn more about photophobia.
I am hole day suffering from pain I have to curtail the window whole day plus i have minus 5 power glass which I can not wear due to light sensitivity problem don't know what to do
the thing that i do not understand is that the Cranial Nerve that carrys light sensory information is the optic nerve, then, how does the trigeminal nerve get stimulated by light? I understand that the Ophthalmic branch of V1 provides sensory innervation the skin of the upper face, cornea and meninges, but none of them have special structures--like the retina of the IICN--that translates photons into action potentials.
Maybe the iris contraction in response to light triggers the mechanoreceptors in the iris, providing a sensory component to V1?
thanks for the video, very helpful all the same
Sensation, in the sense of sensation like pain pressure touch vibration etc for the eye in total is trigeminal nerve. Visual sensation is the optic nerve
@@ahmedjaved3907 yes, I agree on that. but light does not triger vibration, or touch receptors--unless it heats nocireceptors--but photophobia is even to dim light so I do not think these receptors (vibration, touch, heat/cold) are responsible for photophobia.
@@jesuslima4380 Perhaps this review article (www.ncbi.nlm.nih.gov/pmc/articles/PMC3485070/) will shed some light on this? Puns notwithstanding, it seems that there is a light-evoked nociceptive discharge in V1 neurons that can be blocked with lidocaine, found in Okamoto et al. However, a separate paper also found an entirely separate group of retinal ganglion cells that synapse in thalamic centers not traditionally associated with vision and more linked to pain sensation.
@@jesuslima4380 sorry I misunderstood your statement. I think your point about the iris contractions is correct. Hence cycloplegics decrease the pain.
Great as always
Thank you Mr Doctor
Lmao mr doctor
It is the ABRUPT change of light, not light itself. I have very unique vision, I can see fine in all kinds of light. But someone turns on the light switch thinking they're helping me, and it causes a spasm. I've gone from right eye dominant to left eye dominant. The acuity of my eye is strained. I've tried explaining this to my friends and loved ones. Just say "light". It gives me a second to prepare for the change. Few people respect this and I isolate a lot. For whatever reason it can cause me intense pain very briefly. But it hurts like hell.
Thank you.
I have chronic photophobia, and find that dopaminergic drugs (Adderall, Wellbutrin) and also ice bathing improve the symptoms. Do you think my photophobia might be caused by low levels of dopamine / norepinephrine? Thanks
I suffer from chronic photophobia, had a pineal gland cyst resection about 2 years ago - figured it was tied to some disruption in the thalamus, would love to learn more about photophobia.
how you handle this please help me I m also suffering
@@meenajain5759 I wear blue light filter glasses all day and FL-41 when in front of a pc.
@@danielrblend thankyou
I am hole day suffering from pain I have to curtail the window whole day plus i have minus 5 power glass which I can not wear due to light sensitivity problem don't know what to do
@@meenajain5759 Check out Theraspecs, they make the best glasses for folks like us.
Photophobia is abnormal intolerance of light....is it Correct?????
First comment
P