Basics of Ophthalmology for Dental Students
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Questions and Answers

Which muscle is responsible for raising the eyelid?

  • Orbicularis oculi
  • Levator palpebrae superioris (correct)
  • Superior oblique
  • Lateral rectus

What is the function of the sphincter pupillae muscle in the eye?

  • Contracts the pupil (correct)
  • Supplies blood to the retina
  • Dilates the pupil
  • Controls accommodation for near vision

What is the main function of the ciliary body in the eye?

  • Responsible for night vision
  • Contains muscles responsible for accommodation (correct)
  • Nutrition of adjacent structures
  • Secretes tears to keep the eye moist

Which part of the eye is responsible for converting light rays into electric impulses?

<p>Retina (B)</p> Signup and view all the answers

What is the main responsibility of the choroid in the eye?

<p>Nutrition of adjacent structures (A)</p> Signup and view all the answers

What is the purpose of the lacrimal gland in the eye?

<p>Secretes tears to keep the eye moist (B)</p> Signup and view all the answers

What is the function of the optic disc in the eye?

<p>Point where optic nerve leaves the eye (B)</p> Signup and view all the answers

Which part of the eye is rich in cones and responsible for acute sharp vision and color differentiation?

<p>Macula lutea (A)</p> Signup and view all the answers

What is responsible for night vision in the eye?

<p>Rods (B)</p> Signup and view all the answers

Which of these structures in the eye is insensitive to light and known as 'blind spot'?

<p>Optic disc (B)</p> Signup and view all the answers

What type of light receptors are responsible for day vision and color vision in the eye?

<p>Cones (A)</p> Signup and view all the answers

Which nerve supplies all extraocular muscles except superior oblique and lateral rectus in the eye?

<p>Oculomotor nerve (C)</p> Signup and view all the answers

What is the primary cause of iridocyclitis due to systemic disease?

<p>Septic focus in the teeth and oral region (D)</p> Signup and view all the answers

Which eye disease is characterized by an increase in intraocular pressure beyond normal limits?

<p>Glaucoma (B)</p> Signup and view all the answers

Which condition is characterized by protrusion of the eyeball forward?

<p>Proptosis (C)</p> Signup and view all the answers

What is the primary cause of acute primary glaucoma?

<p>Elderly patients (over 60 years) (D)</p> Signup and view all the answers

What type of glaucoma has no primary cause found?

<p>Congenital glaucoma (D)</p> Signup and view all the answers

Which eye disease is characterized by separation of the neurosensory retina from the underlying choroid?

<p>Retinal detachment (B)</p> Signup and view all the answers

What is the treatment for cataract?

<p>Cataract extraction operation by phacoemulsification (B)</p> Signup and view all the answers

Which condition results in lack of sharp distinct retinal image due to parallel rays not focusing on the retina?

<p>(Ametropia) (D)</p> Signup and view all the answers

What is used to correct hyperopia (far-sightedness)?

<p>Concave lenses (B)</p> Signup and view all the answers

What is the function of the cornea?

<p>To admit light into the eye and serve as the main refractive surface (A)</p> Signup and view all the answers

Which part of the eye is pierced by the optic nerve?

<p>Sclera (A)</p> Signup and view all the answers

What is the function of the uveal tract?

<p>To serve as the vascular, pigmented, and nutritive layer of the eyeball (D)</p> Signup and view all the answers

What is the diameter of the cornea?

<p>11 mm (B)</p> Signup and view all the answers

Which part of the eye forms the colored part of the eye?

<p>Iris (B)</p> Signup and view all the answers

What is the main function of the retina?

<p>To convert light into electrical impulses (C)</p> Signup and view all the answers

What is the thickness of the cornea?

<p>0.5 mm (C)</p> Signup and view all the answers

What forms the outer protective coat of the eyeball?

<p>Cornea and sclera (A)</p> Signup and view all the answers

What is the role of the iris in controlling light entering the eye?

<p>To control the amount of light entering the eye via its central opening called pupil (A)</p> Signup and view all the answers

What is the main function of the middle layer of the eyeball?

<p>To serve as a vascular, pigmented, and nutritive layer for the eyeball (C)</p> Signup and view all the answers

What is the structure that forms the posterior 5/6 of the outer coat of the eyeball?

<p>Sclera (C)</p> Signup and view all the answers

What allows free movement of the eyeball in all directions?

<p>Extraocular muscles (C)</p> Signup and view all the answers

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