OPTOMETRY EYE ANATOMY QUIZ
Welcome to Part 1 of our ultimate optometry and eye anatomy MCQ series! This advanced section shifts focus to the precise numerical data and structural measurements that are vital for mastering clinical ophthalmology.
From the exact refractive indices of the ocular media—such as the cornea, aqueous humor, and lens—to the specific dimensions, weight, and volume of the human eyeball, this quiz covers the core optical values every optometry student and healthcare professional must know by heart.
In addition to refractive power and ocular dimensions, these 50 carefully crafted multiple-choice questions dive deep into the microscopic anatomy of the eye. You will test your knowledge on the distinct layers of the cornea—including the specific functions of the endothelium and the recently discovered Dua's layer—as well as the complex cellular structure of the retina.
Attempt Part 2: Test Your Eye Anatomy Knowledge: 50 Advanced Optometry MCQsDive into these practice questions to evaluate your exam readiness, clear your doubts with our detailed explanations, and strengthen your clinical foundation!
Start Quizzes [MCQs]
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Q. 1: How is the shape of the eyeball ?
A) Oval
B) Approximately Spherical
C) Cap-shaped
D) Triangular
EXPLANATION: The eyeball is approximately spherical in shape with a diameter of about 2.3 cm
Q. 2: Vertical diameter of eyeball ?
A) 23 mm
B) 23.5 mm
C) 24 mm
D) 70 mm
EXPLANATION: Vertical diameter of eyeball = 23 mm
Q. 3: Horizontal diameter of eyeball ?
A) 23 mm
B) 23.5 mm
C) 24 mm
D) 70 mm
EXPLANATION: Horizontal diameter of eyeball = 23.5 mm
Q. 4: Antero-posterior diameter of eyeball ?
A) 23 mm
B) 23.5 mm
C) 24 mm
D) 70 mm
EXPLANATION: Antero-posterior diameter of eyeball = 24 mm
Q. 5: Circumference of the eyeball ?
A) 23 mm
B) 23.5 mm
C) 24 mm
D) 70 mm
EXPLANATION: Circumference of the eyeball = 70 mm
Q. 6: Volume of the eyeball ?
A) 10 mL
B) 8 mL
C) 7 mL
D) 6.5 mL
EXPLANATION: Volume of the eyeball = 6.5 mL
Q. 7: Weight of the eyeball ?
A) 10 g
B) 8 g
C) 7 g
D) 6.5 g
EXPLANATION: Weight of the eyeball = 7 g
Q. 8: How many layers/coats present in the eyeball ?
A) 3
B) 4
C) 5
D) 10
EXPLANATION: Three layers/coats present in the eyeball = Fibrous (Outer), Uveal (Middle), Nervous (Inner)
Q. 9: Which is not a part of uvea ?
A) Iris
B) Retina
C) Ciliary body
D) Choroid
EXPLANATION: Retina is the part of inner layer of the eyeball.
Q. 10: Refractive index of cornea ?
A) 1.376
B) 1.336
C) 1.39
D) 1.337
EXPLANATION: Refractive index of cornea = 1.376
Q. 11: Refractive index of Aqueous humour ?
A) 1.376
B) 1.336
C) 1.39
D) 1.337
EXPLANATION: Refractive index of Aqueous humour = 1.336
Q. 12: Refractive index of human eye's lens ?
A) 1.376
B) 1.336
C) 1.39
D) 1.337
EXPLANATION: Refractive index of human eye's lens = 1.39
Q. 13: Refractive index of Vitreous humour ?
A) 1.376
B) 1.336
C) 1.39
D) 1.337
EXPLANATION: Refractive index of Vitreous humour = 1.337
Q. 14: Refractive Power of the human's eye approximately ?
A) 15D
B) 60D
C) 45D
D) 70D
EXPLANATION: Refractive Power of the human's eye approximately = 60D
Q. 15: Refractive Power of the human's cornea approximately ?
A) 15D
B) 60D
C) 45D
D) 70D
EXPLANATION: Refractive Power of the human's cornea approximately = 45D
Q. 16: Refractive Power of the human's eye-lens approximately ?
A) 15D
B) 60D
C) 45D
D) 70D
EXPLANATION: Refractive Power of the human's eye-lens approximately = 15D
Q. 17: Eye's Refractive power becomes in myopic patient ?
A) 15D
B) 60D
C) 45D
D) 70D
EXPLANATION: Refractive power becomes in myopic patient = 70D
Q. 18: Eye's Refractive power becomes in hypermetropic patient ?
A) 15D
B) 60D
C) 50D
D) 70D
EXPLANATION: Eye's Refractive power becomes in hypermetropic patient = 50D approx
Q. 19: Deep of the aqueous chamber from antero-posterior in adults ?
A) 2.5 mm
B) 23.5 mm
C) 24 mm
D) 70 mm
EXPLANATION: Deep of the aqueous chamber from antero-posterior in adults = 2.5 mm
Q. 20: Volume of the Aqueous humour ?
A) 10 mL
B) 0.31 mL
C) 7 mL
D) 6.5 mL
EXPLANATION: Volume of the Aqueous humour = 0.31 mL
Q. 21: Volume of the Aqueous humour in anterior chamber ?
A) 10 mL
B) 0.31 mL
C) 7 mL
D) 0.25 mL
EXPLANATION: Volume of the Aqueous humour in anterior chamber = 0.25 mL
Q. 22: Volume of the Aqueous humour in posterior chamber ?
A) 0.06 mL
B) 0.31 mL
C) 7 mL
D) 0.25 mL
EXPLANATION: Volume of the Aqueous humour in posterior chamber = 0.06 mL
Q. 23: Horizontal diameter of cornea ?
A) 11.7 mm
B) 23.5 mm
C) 11 mm
D) 70 mm
EXPLANATION: Horizontal diameter of cornea = Approximately 11.7 mm
Q. 24: Vertical diameter of cornea ?
A) 11.7 mm
B) 23.5 mm
C) 11 mm
D) 70 mm
EXPLANATION: Vertical diameter of cornea approximately = 11 mm
Q. 25: Thickness of cornea in the center ?
A) 11.7 mm
B) 0.52 mm
C) 11 mm
D) 70 mm
EXPLANATION: Thickness of cornea in the center approximately = 0.52 mm
Q. 26: Thickness of cornea in the periphery approximately ?
A) 11.7 mm
B) 0.52 mm
C) 11 mm
D) 0.7 mm
EXPLANATION: Thickness of cornea in the periphery approximately = 0.7 mm
Q. 27: Diameter of the human's eye lens approx ?
A) 11.7 mm
B) 0.52 mm
C) 9-10 mm
D) 70 mm
EXPLANATION: Diameter of the human's eye lens approximately = 9-10 mm
Q. 28: Thickness of the human's eye lens approximately ?
A) 11.7 mm
B) 0.52 mm
C) 3.5-5 mm
D) 17 mm
EXPLANATION: Thickness of the human's eye lens approximately = 3.5 mm at birth and 5 mm approx after aging
Q. 29: Weight of the human's eye lens approximately ?
A) 2.5 mg
B) 23.5-40 mg
C) 135-255 mg
D) 70 mg
EXPLANATION: Weight of the human's eye lens approximately = 135 mg at birth and 255 mg after aging
Q. 30: Radius of curvature of the anterior surface of the human eye lens approximately ?
A) 10 mm
B) 0.31 mm
C) 7 mm
D) 6.5 mm
EXPLANATION: Radius of curvature of the anterior surface of the human eye lens approximately = 10 mm
Q. 31: Volume of the Vitreous humour ?
A) 10 mL
B) 0.31 mL
C) 4 mL
D) 0.25 mL
EXPLANATION: Volume of the Vitreous humour = 4 mL
Q. 32: Radius of curvature of the posterior surface of the human eye lens approximately ?
A) 10 mm
B) 0.31 mm
C) 7 mm
D) 6 mm
EXPLANATION: Radius of curvature of the posterior surface of the human eye lens approximately = 6 mm
Q. 33: Normal IOP is about ?
A) 100 mmHg
B) 130 mmHg
C) 5 mmHg
D) 15 mmHg
EXPLANATION: Normal IOP is about = 15 mmHg (Varies between 10.5 mmHg to 21 mmHg)
Q. 34: Which is not correct normal temperature of the human body ?
A) 37°C
B) 98.6 °F
C) 96.8 °F
D) 310.15K
EXPLANATION: Normal temperature of the human body = 37°C, 98.6 °F, 310.15K
Q. 35: Which of the following structures of the eye are avascular ?
A) Cornea + Iris
B) Iris + Lens
C) Lens + Cornea
D) Lens + Retina
EXPLANATION: Cornea and lens are avascular.
Q. 36: How many layers present in cornea ?
A) 5
B) 6
C) 7
D) 8
EXPLANATION: Total six layers present in cornea.
Q. 37: Thickest layer of the cornea ?
A) Corneal endothelium
B) Stroma of cornea
C) Bowman's layer
D) Dua's layer
EXPLANATION: Stroma of cornea is thickest layer of the cornea.
Q. 38: Name of the cornea's layer which thinnest and hardest ?
A) Corneal epithelium
B) Stroma of cornea
C) Descemet's layer
D) Dua's layer
EXPLANATION: Dua's layer is thinnest and hardest layer of the cornea.
Q. 39: Name of the cornea's layer which contact from aqueous humour ?
A) Corneal endothelium
B) Stroma of cornea
C) Bowman's layer
D) Dua's layer
EXPLANATION: Corneal endothelium is contact from aqueous humour for cornea's nourishment.
Q. 40: When and who discovered Dua's Layer ?
A) 2013 - Harminder Singh Dua
B) 2007 - Harminder Singh Dua
C) 2000 - Harminder Singh Dua
D) 1955 - Dr. Charles
EXPLANATION: Harminder Singh Dua discovered the Dua layer in 2013.
Q. 41: Which are not cellular components of cornea ?
A) Epithelial cells
B) Glycosaminoglycans + Collagen F.
C) Endothelial cells
D) Keratocytes
EXPLANATION: Glycosaminoglycans and Collagen Fibres are acellular components of cornea.
Q. 42: Thickness of corneal epithelium layer ?
A) 50-60 µm
B) 4-6 µm
C) 500-600 µm
D) 100-120 µm
EXPLANATION: Thickness of corneal epithelium layer = 50-60 µm
Q. 43: Which of the following is not a function of the corneal epithelium ?
A) Protection from Infections
B) Preventing loss of fluid
C) Transparency
D) Ions exchange
EXPLANATION: Ions exchange is function of corneal endothelium.
Q. 44: Which Corneal layer has no regeneration capacity ?
A) Cornea Endothelium
B) Bowman's layer
C) Dua's layer
D) Stroma of cornea
EXPLANATION: The Bowman's layer has no regeneration capacity. Damage to this layer can result in a scar.
Q. 45: Ions and ATPase pumps present in corneal layer ?
A) Cornea Endothelium
B) Bowman's layer
C) Dua's layer
D) Stroma of cornea
EXPLANATION: Ions and ATPase pumps present in Cornea Endothelium.
Q. 46: Which of the following layer maintains stromal hydration ?
A) Corneal endothelium
B) Stroma of cornea
C) Bowman's layer
D) Dua's layer
EXPLANATION: Corneal endothelium is maintains stromal hydration.
Q. 47: How many layers present in retina ?
A) 9
B) 10
C) 11
D) 5
EXPLANATION: 10 layers presented in Retina.
Q. 48: Which layer of retina contact to the choroid ?
A) Outer limiting membrane
B) Retinal pigmented epithelium
C) Inner limiting membranr
D) Ganglion cell layer
EXPLANATION: Retinal pigmented epithelium layer of retina contact to the choroid.
Q. 49: Which layer of retina consists rod and cones cells ?
A) Ganglion cell layer
B) Photoreceptor layer
C) Inner plexiform layer
D) Nerve Fibre layer
EXPLANATION: Photoreceptor layer of retina consists rod and cones cells
Q. 50: Which are the photoreceptor cells of Retna ?
A) Rods + Bipolar cells
B) Horizontal + Cones
C) Rods + cones
D) Retinal ganglion cells
EXPLANATION: Rods and cones are the photoreceptor cells of Retna.
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