1)Conditions where corneal sensation are lost? 2)Are there any conditions where there is pain in eyes due to corneal disease but corneal sensation is absent?
A. CONGENITAL: i. Congenital trigeminal anesthesia. ii. Corneal dystrophies B. ACQUIRED: i. Diabetes mellitus: reduces sensitivity. ii. Herpes simplex keratitis. iii. Leprosy. iv. Adie’s tonic pupil v. Myasthenia gravis. vi. Toxic corneal hypoesthesia: C. PHYSIOLOGICAL: i. Iris color-lighters the iris color, more the sensitivity. ii. Gender-more sensitive in males than females. iii. Eyelid closure: decreases sensitivity. This is due to depressed acetylcholine levels with lid close. This is the reason for low corneal sensitivity in morning after a night’s sleep. D. PHARMACOLOGICAL: i. Surface anesthetics like 4% lignocaine, 0.5% proparacaine. ii. Beta blockers-temporary decrease. iii. Sodium sulfacetamide-30% solution decreases sensitivity. iv. Atropine-decreases sensitivity after 10 minutes of instillation. This is due to decreased acetylcholine. E. HORMONAL: i. Preovulatory reduction in corneal sensations due to estrogen rise. ii. Decreased corneal sensitivity during pregnancy. F. MECHANICAL: i. Contact lens: decreases corneal sensitivity. This may be attributed to the decrease in oxygen pressure at epithelial level. G. SURGICAL: i. Limbal incisions ii. Corneal grafts iii. Refractive surgeries: LASIK decreases sensations. iv. Other procedures: Photocoagulation and retinal detachment surgeries. v. Trigeminal denervation
The second Q more or less reflects the 1st. Any corneal lesion should induce pain but if the corneal nerves are bad in quantity/ quality the pt cannot perceive the sensation.
Thank you sir for explaining the concept in a very nice way ❤
Your emr round are life savoir, man!! Please add more of them. 😊😊
Most helpful of all the videos I've watched for insight. Thank you so much!
Thank you for this precise summation, Dr. Pranesh!
Thank you so much sir...like always learned a lot...
Your videos are so good
Thanks
Hello, I am a DNB resident..pls if u can share how to make corneal diagrams.. thanks in advance
very informative
Thank you sir
Thank you
1)Conditions where corneal sensation are lost?
2)Are there any conditions where there is pain in eyes due to corneal disease but corneal sensation is absent?
A. CONGENITAL:
i. Congenital trigeminal anesthesia.
ii. Corneal dystrophies
B. ACQUIRED:
i. Diabetes mellitus: reduces sensitivity.
ii. Herpes simplex keratitis.
iii. Leprosy.
iv. Adie’s tonic pupil
v. Myasthenia gravis.
vi. Toxic corneal hypoesthesia:
C. PHYSIOLOGICAL:
i. Iris color-lighters the iris color, more the sensitivity.
ii. Gender-more sensitive in males than females.
iii. Eyelid closure: decreases sensitivity. This is due to depressed acetylcholine levels with lid close. This is the reason for low corneal sensitivity in morning after a night’s sleep.
D. PHARMACOLOGICAL:
i. Surface anesthetics like 4% lignocaine, 0.5% proparacaine.
ii. Beta blockers-temporary decrease.
iii. Sodium sulfacetamide-30% solution decreases sensitivity.
iv. Atropine-decreases sensitivity after 10 minutes of instillation. This is due to decreased acetylcholine.
E. HORMONAL:
i. Preovulatory reduction in corneal sensations due to estrogen rise.
ii. Decreased corneal sensitivity during pregnancy.
F. MECHANICAL:
i. Contact lens: decreases corneal sensitivity. This may be attributed to the decrease in oxygen pressure at epithelial level.
G. SURGICAL:
i. Limbal incisions
ii. Corneal grafts
iii. Refractive surgeries: LASIK decreases sensations.
iv. Other procedures: Photocoagulation and retinal detachment surgeries.
v. Trigeminal denervation
@@pranesh thank you sir , what is the answer for 2nd question??
The second Q more or less reflects the 1st. Any corneal lesion should induce pain but if the corneal nerves are bad in quantity/ quality the pt cannot perceive the sensation.
To give an answer, I feel the viral keratitis and systemic diseases like DM will cause pt not to perceive the pain despite the lesion
@@pranesh thank you sir 🙏🙏
Sir how do we calculate the depth dimensions in mm??
Thankyou sir.
I HAD THIS ON MY PUPIL A FEW TIMES, ANTIBIOTIC DROPS CURES IT
awesome
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