Contact Lens Materials Practice Questions

Question 1

Which of the following is Iso-osmolar agent?

Accepted Answer

Non-ionic Dimer contrast media

Answer

Ionic Monomer - High osmolality contrast media

Answer

Non-ionic Monomer - Low osmolality contrast media

Answer

Ionic Dimer - Low osmolality contrast media

Question 2

What is the most effective method for handling impression compound to ensure accurate impressions?

Accepted Answer

Allowing the impression to cool in the mouth before removal.

Answer

Heating with an ethanol frame and placing it directly in the patient's mouth.

Answer

Heating in hot water and quenching in water for 20 minutes.

Answer

Melting in boiling water at 100°C for one hour.

Question 3

Which of the following is a true statement regarding the human eye?

Accepted Answer

Normal eye medium will permit wavelengths of 400-700 nm

Answer

Lens will not reflect light

Answer

Even after cataract surgery UV rays do not penetrate

Answer

Cornea cuts off wavelengths up to 400 nm

Question 4

Which of the following statements is false about phacolytic glaucoma?

Accepted Answer

Primarily caused by iris-lens contact

Answer

Open angle glaucoma

Answer

Lens induced glaucoma

Answer

Seen in hypermature stage of cataract

Question 5

Which of the following is an advantage of contact lenses over normal glasses?

Accepted Answer

Improved peripheral vision

Answer

Reduced prismatic effect

Answer

Decreased risk of infection

Answer

UV protection (in specific lenses)

Question 6

A patient with contact lens use for the past 2 years presents with the ocular findings shown in the image below. What is the most probable diagnosis?

Accepted Answer

Giant Papillary conjunctivitis

Answer

Trachoma

Answer

Ocular Surface Squamous Neoplasia (OSSN)

Answer

Vernal Keratoconjunctivitis

Question 7

Which among the following is the BEST irrigating fluid during ECCE?

Accepted Answer

Balanced salt solution + glutathione

Answer

Ringer lactate

Answer

Normal saline

Answer

Balanced salt solution

Question 8

What is the most common infection in contact lens users?

Accepted Answer

Pseudomonas

Answer

Streptococcus

Answer

Staphylococcus

Answer

Neisseria

Question 9

Keratitis in contact lens wearers is caused by all except?

Accepted Answer

Pneumococcus

Answer

Chlamydia

Answer

Aspergillus

Answer

Pseudomonas

Question 10

A young boy who used to wash his contact lenses in tap water or with unhygienic lens fluid developed keratitis. Microscopy revealed an organism with spiked or star-shaped structures. Identify the correct organism responsible.

Accepted Answer

Acanthamoeba

Answer

Balantidium

Answer

Pseudomonas

Answer

Staphylococcus aureus

Contact Lens Materials — MCQs

Contact Lens Materials — MCQs

Want unlimited practice?