WorksheetsEye Lens Quiz
Total questions: 15
Worksheet time: 8mins
What is the primary function of the lens in the eye?
Light absorption
Light refraction
Light generation
Light filtration
During the process of accommodation to view a near object, which of the following changes occurs regarding the curvature and shape of the crystalline lens?
The anterior surface becomes more spherical (increases curvature), while the posterior surface remains completely unchanged.
The anterior surface increases its curvature significantly more than the posterior surface, leading to an increase in total dioptric power.
Both surfaces flatten equally due to the contraction of the ciliary muscle pulling the zonules taut.
he posterior surface increases its curvature significantly more than the anterior surface to shift the focal point forward.
Which structure is responsible for maintaining the shape of the lens?
Ciliary body
Sclera
Cornea
Retina
What age-related change in the lens is characterized by a loss of elasticity and accommodation ability?
Cataract
Presbyopia
Myopia
Hyperopia
Which type of cataract is most commonly associated with aging?
Congenital cataracts
Traumatic cataracts
Nuclear sclerosis
Posterior subcapsular cataract
In which part of the eye is the lens located?
Anterior chamber
Vitreous chamber
Posterior chamber
Intraocular space
What is the primary protein found in the lens that is critical for its transparency?
Keratin
Collagen
Crystallins
Fibronectin
Which condition can develop when proteins in the lens aggregate and cloud the lens?
Floaters
Glaucoma
Cataracts
Diabetic retinopathy
What is the approximate percentage of refractive index of the lens for the eye?
25%
50%
75%
90%
Which of the following factors is NOT typically associated with an increased risk of cataract formation?
Smoking
Diabetes
High UV exposure
Regular exercise
What is the most common surgical procedure for treating significant cataracts?
Keratoplasty
Vitrectomy
Phacoemulsification
Laser peripheral iridotomy
12. A 28-year-old girl who had previous history of injury in the left eye presents with opicity of the left lens. Her vision of the right eye is normal; but the left eye cannot even percieve the light. She is about to under go cataract extraction soon. Indication for that cataract surgery is:
To visualise the retina
Theraputic indication
Cosmatic reason
To have better vision
13. Common complication after cataract surgery is
Rupture of capsule
Posterior capsule thickening (PCT)
Endophthalmitis
Dislocation of lens
14. Uneven curvature of cornea after cataract surgery is commonly resulted in
Fantolaser cataract surgery
Intracapsular cataract extraction (ICCE)
Phacoemulsification
Manual Extracapsular Cataract Surgery (ECCE)
During embryonic development, the crystalline lens of the eye originates from which of the following embryonic layers?
Mesoderm
Surface ectoderm
Neural ectoderm
Endoderm
