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Cornea, ophthalmology

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 Lecture Video

Part 1, Anatomy, histo, physio of cornea




 part 2 , bacterial Keratitis 




 part 3 , protozoal and fungal Keratitis




Part 4, viral keratitis 






 part 5 , keratoconus 





Questions



(1) 
 40year old woman complaining of continuous watering of the eye , swelling in medial canthal area recurrent mucopurulent discharge .now she is complaining of acute onset of stitching pain and defective vision culture and sensitivity test commonly show:
a. Staph 
 b. Pneumococci
c. Strept
 d. diphtheria
(2) 
 20years old female complaining of severe painful diminution of vision on examination there is positive fluorescein stain with thickened corneal nerves patient give history of contact lens wearing treatment should include:
a. fluconazole
 b. Amphotericin
c. Chlorhexidine
 D. Ganciclovir

(3) Leucoma adherent may occur in:
a-Healed peripheral Descemetocele
 b-large peripheral perforation
c-peripheral dendritic ulcer
 d-all of the above

(4) Descemetocele formation is uncommon with:
 a-Gonococci
. b-Pneumococci.
 c-Streptococci. 
 d-Pseudomonas.

(5) Exposure keratitis usually start at:
a-The lower third of the cornea.
 b-The middle third of the cornea. 
c-The upper third of the cornea. 
 d-The centre of the cornea.


(6) Topical steroids are contraindicated in corneal ulcers except:
a- Phlyctenular fascicular ulcer
 b-Dendritic ulcer
c-Typical hypopyon ulcer
 d-Atypical hypopyon ulcer

(7) 
Topical steroids could be used in herpetic keratitis in case of
a. Epithelial dendritic lesion.
 b. Stromal disciform lesion.
c. Diminished corneal sensation.
 d. Elevated IOP.
(8) 
Dense scar of cornea with incarceration of iris is known as
a. Leucoma adherent
 b. Dense leucoma
c. Ciliary staphyloma
 d. Iris bombe


(9)
 Cornea is supplied by nerve fibers derived from
a. Trochlear nerve
 b. Optic nerve
c. nasociliary nerve
 d. frontal nerve


(10) The fluorescein stain used in the following except:
a. Tear breakup time test
 B. Jones test
c. Seidel test
 D. Interstitial keratitis

(11) Herpes simplex keratitis is characterized by:
a. hypopyon
 b. No tendency to recurrence
c. Corneal hypoesthesia
 d. Tendency to perforation

(12) Serpiginous ulcers include the following except:
a. Mooren’s ulcer
 B. Typical hypopyon ulcer
c. Fascicular ulcer
 D. trachomatous ulcer

(13) Infective ulcers characterized by all the following except:
a. Rapidly progressive 
 b. have epithelial defect.
c. Mild pain.
 d. Associated with anterior chamber reaction.

(14) Hutchinson’s sign indicate:
a. increase risk of corneal affection by herpes simplex.
b. increase risk of corneal affection by herpes zoster.
c. decrease risk of corneal affection by herpes zoster.
d. decrease risk of corneal affection by herpes simplex.

(15) Fungal Keratitis should be considered when there is:
(a) Plant origin trauma. 
 (b) Dry eye syndrome.
(c) Rise of IOP. 
 (d) Chemical injury.

(16) Double Staining (Fluorescein and Rose Bengal) used to diagnose:
(a) Traumatic corneal ulcer 
 (b) Dendritic Ulcer.
(c) Hypopyon Ulcer. 
 (d) Mooren’s ulcer.

(17) Topography findings in keratoconus include all the following except:
a. K-readings >47 D.
 b. Corneal thinning.
c. Evidence of back elevation 
 d. Regular topography.

(18) Moderate keratoconus can be treated by all the following except:
a. Collagen cross-linking. 
 b. Rigid gas permeable contact Lens.
c. Spectacles.
 d. Intracorneal ring segments.

(19) Acute hydrops in a case of keratoconus is due to:
(a) Break of the Stromal layer.
 (b) Break in the Descemet’s membrane.
(c) Loss of the epithelium.
 (d) Loss of the Stroma.

(20) Band shaped keratopathy is commonly caused by deposition of:
a. Magnesium salt
b. Calcium salt
c. Ferrous salt
d. Copper salt

(21) Irrespective of the etiology of a corneal ulcer, the drug always indicated is:
a. Corticosteroids
b. Cycloplegics
c. Antibiotics
d. Antifungals

(22) Dense scar of cornea with incarceration of iris is known as:
a. Leucoma adherence
b. Dense leucoma
c. Ciliary staphyloma
d. Iris bombe.

(23) Corneal sensations are lost in:
a. herpes simplex
a) Conjunctivitis
b) Fungal infections
c) Marginal keratitis

(24) The color of fluorescein staining in corneal ulcer is:
a. Yellow
b. Blue
c. Green
d. Royal blue

(25) Which of the following organism can penetrate intact corneal epithelium:
A. Strept pyogenes
B. Staph aureus
C. Pseudomonas pyocyanaea
D. Corynebacterium diphtheriae

(26) In viral epidemic kerato-conjunctivitis characteristically there is:
a. Copious purulent discharge
a) Copious muco-purulent discharge
b) Excessive watery lacrimation
c) Mucoid ropy white discharge

(27) Fifth nerve palsy could cause:
a. Ptosis
b. Proptosis
c. Neurotrophic keratitis
d. Lagophthalmos

(28) Topical steroids are contraindicated in a case of bacterial corneal ulcer for fear of:
a. Secondary glaucoma,
b. Cortical cataract.
c. Corneal perforation,
d. Secondary viral infection.

(29) The sure diagnostic sign of corneal ulcer:
a. Ciliary injection
b. Blepharospasm
c. Miosis
d. Positive fluorescein test.

(30) The effective treatment of dendritic ulcer of the cornea is:
a. Surface anesthesia
b. Local corticosteroids
c. Systemic corticosteroids
d. Acyclovir ointment.

(31) Cornea is thinned in:
a. Keratoconus
b. Fuchs’s dystrophy
c. Bulbous lesion
d.All of the above
b. Poxvirus

(32) Which of the following is not a source of nutrients to the cornea:
a. Air
b. Aqueous humor
c. Perilimbal capillaries
d. Vitreous humor

(33) The commonest cause of hypopyon corneal ulcer is:
a. Moraxella
b. Gonococcus
c. Pneumococcus
d. Staphylococcus
e. diphtheria

(34) Cornea is supplied by nerve fibers derived from:
a. Trochlear nerve
b. Optic nerve
c. Trigeminal nerve
d. Oculomotor nerve

(35) Not true about herpes keratitis:
a. Steroids accelerates recovery
b. Present in trigeminal ganglia
c. Recurrent
d. Usually, unilateral


(36) Herpetic corneal ulcer is diagnosed by:
a. Geimsa stain
b. EL1SA
c. Cell culture/PCR
d. Rose Bengal stain

(37) Most common viral infection of the cornea is:
a. Herpes simplex
b. Herpes zoster
c. Adenovirus
d. Molluscum contagiosum

(38) A 30-year-old male presents with a history of injury to the eye with a leaf 5 days ago and pain, photophobia and redness of the eye for 2 days.
What would be the most likely pathology:
a. Anterior uveitis
b. Conjunctivitis
c. Fungal corneal ulcer
d. Corneal laceration

Answers

1) Pneumococci
2) Chlorhexidine
3) large peripheral perforation.
4) Pneumococci
5) The lower third of the cornea
6) Phlyctenular fascicular ulcer 7) Stromal disciform lesion.
8) Leucoma adherent.
9) nasociliary nerve
10) Interstitial keratitis
11) Corneal hypoesthesia.
12) trachomatous ulcer.
13) Mild pain.
14) increase risk of corneal affection by herpes zoster.
15) Plant origin trauma. 16) Dendritic Ulcer. 17) Regular topography
18) Spectacles.
19) Break in the Descemet’s membrane.
20) Calcium salt 21) Cycloplegics
22) Leucoma adherence
23) herpes simplex
24) Green
25) Corynebacterium diphtheria
26) Excessive watery lacrimation
27) Neurotrophic keratitis
28) Corneal perforation
29) Positive fluorescein test
30) Acyclovir ointment
31) Keratoconus
32) Vitreous humor
33) Pneumococcus
34) Trigeminal nerve
35) Steroids accelerates recovery
36) Rose Bengal stain
37) Herpes simplex
38) Fungal corneal ulcer

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