Ophthalmic Pharmacology Practice Questions

Q: Drug commonly used as immunosuppressive therapy for non-infectious uveitis is -

Cyclosporine. ***Cyclosporine*** - **Cyclosporine** is a **calcineurin inhibitor** that is commonly used as an immunosuppressive agent for **non-infectious uveitis**, particularly for sight-threatening or refractory cases [3]. - It works by inhibiting T-lymphocyte activation, thereby reducing intraocular inflammation [3]. - While effective, its use may be limited by side effects including **nephrotoxicity, hypertension, and hirsutism**. *Methotrexate* - **Methotrexate** is also **commonly used** as a first-line systemic immunosuppressive agent for non-infectious uveitis [1]. - It is an **antimetabolite** that inhibits dihydrofolate reductase, reducing inflammation and cell proliferation. - Often preferred due to its **favorable side effect profile** compared to cyclosporine, though both drugs are considered standard options. *Infliximab* - **Infliximab** is a **TNF-alpha inhibitor** (biologic agent) used for **severe or treatment-resistant uveitis**, particularly in cases associated with systemic inflammatory diseases like **Behçet's disease or ankylosing spondylitis** [2]. - It is generally considered a **second-line or third-line agent** after conventional immunosuppressants have failed. *Voclosporin* - **Voclosporin** is a **next-generation calcineurin inhibitor** primarily approved for **lupus nephritis**. - It is **not a standard therapy** for non-infectious uveitis and has limited data in this indication.

Q: Which of the following is a contraindication to topical steroids?

Dendritic ulcer. ***Dendritic ulcer*** - A **dendritic ulcer** is characteristic of **herpes simplex keratitis**, which is an active viral infection of the cornea. - **Topical steroids** are contraindicated because they can suppress the immune response, leading to viral replication, corneal melt, and potentially severe vision loss or perforation. *Herpetic stromal keratitis without epithelial defect* - In cases of **stromal keratitis**, where the infection is deeper and an intact epithelium is present, topical steroids may be used cautiously in conjunction with antiviral agents to reduce inflammation and scarring. - The primary concern with steroids in herpes simplex keratitis is activating viral replication in the presence of an **epithelial defect**, which is not present here. *Elevated intraocular pressure* - **Elevated intraocular pressure** is a known side effect of topical steroid use, especially with prolonged administration, but it is not an absolute contraindication in itself. - It necessitates careful monitoring and may require concurrent glaucoma treatment, but the primary condition needing steroids may still warrant their use. *Non-infectious anterior uveitis* - **Topical corticosteroids** are the **mainstay of treatment** for non-infectious anterior uveitis to reduce inflammation and prevent complications such as synechiae and vision loss. - The benefits of controlling inflammation in uveitis generally outweigh the risks associated with judicious steroid use.

Q: Floppy iris syndrome is associated with usage of

Selective alpha-adrenergic antagonist. ***Selective alpha-adrenergic antagonist*** - **Intraoperative Floppy Iris Syndrome (IFIS)** is classically associated with the use of **alpha-1 adrenergic antagonists**, particularly **tamsulosin**. - These drugs cause **flaccidity of the iris** and **prolapse through the incision** during **cataract surgery** by blocking **alpha-1 receptors** in the iris dilator muscle. *5 alpha reductase inhibitor* - These drugs, such as **finasteride** and **dutasteride**, inhibit the conversion of **testosterone to dihydrotestosterone (DHT)**. - They are used to treat **benign prostatic hyperplasia (BPH)** and **androgenetic alopecia** and have no known association with IFIS. *PDE-5 inhibitor* - **Phosphodiesterase-5 (PDE5) inhibitors** like **sildenafil** and **tadalafil** are used to treat **erectile dysfunction**. - While they can cause visual disturbances due to effects on retinal PDE6, they are **not associated with IFIS**. *Anticholinergics* - **Anticholinergic drugs** block the action of **acetylcholine** and are used for various conditions, including **overactive bladder** and **irritable bowel syndrome**. - They tend to cause **mydriasis (pupil dilation)**, but they do **not cause iris floppiness** or IFIS.

Q: What is a common side effect of long-term topical steroid use in the eye?

Cataract formation. ***Cataract formation*** - Long-term use of **topical corticosteroids** can lead to the development of **posterior subcapsular cataracts** due to their metabolic effects on lens proteins. - This is a well-established and significant complication, often requiring surgical intervention. - **Note**: The other major sight-threatening complication of long-term topical steroid use is **steroid-induced glaucoma**, which occurs due to increased intraocular pressure from reduced aqueous outflow. *Dry eye syndrome* - While dry eye can be associated with various ocular conditions, it is not a direct or common side effect of **topical steroid use**. - Steroids can sometimes mask inflammation that contributes to dry eye, but they don't typically induce it. *Allergic conjunctivitis* - **Allergic conjunctivitis** is an inflammatory response to an allergen, characterized by itching, redness, and swelling. - Topical steroids are often used to *treat* severe allergic conjunctivitis due to their **anti-inflammatory properties**, not to cause it. *Subconjunctival hemorrhage* - A **subconjunctival hemorrhage** is usually caused by a sudden increase in venous pressure (e.g., coughing, straining) or trauma, leading to bleeding under the conjunctiva. - It is not a common side effect of **topical steroid application**.

Q: The percentage of atropine present in atropine drops as cycloplegic is:

1%. ***1%*** - A **1% solution of atropine** is the standard concentration used as a cycloplegic agent for ophthalmic purposes. - This concentration is effective in causing **ciliary muscle paralysis** and pupillary dilation (mydriasis) for examination and treatment. *0.5%* - A **0.5% solution** of atropine is generally too weak to achieve a full and reliable cycloplegic effect in most clinical scenarios. - While it may cause some dilation, it often does not provide adequate **ciliary muscle paralysis** for comprehensive cycloplegic refraction. *4%* - A **4% solution** of atropine is an unusually high concentration for ophthalmic use and carries a significantly increased risk of systemic and local side effects. - Such a high concentration is not typically used as a cycloplegic due to the potential for severe adverse reactions like **tachycardia**, **dry mouth**, and **flushing**. *2%* - While a **2% solution** is stronger than the commonly used 1%, it is not the standard concentration and may lead to a higher incidence of side effects without a significant increase in cycloplegic efficacy. - The standard and most widely accepted concentration for atropine as a cycloplegic is **1%**, balancing efficacy and safety.

Q: What is the drug of choice for treating intermediate uveitis?

Systemic steroids. ***Systemic steroids*** - **Systemic steroids** are the **drug of choice** for treating intermediate uveitis, especially when inflammation is significant or vision is threatened. - They effectively suppress the expansive **intraocular inflammation** typical of intermediate uveitis, which often involves the **vitreous** and **peripheral retina**. *Atropine* - **Atropine** is a **cycloplegic agent** primarily used to relieve ciliary spasm and prevent synechiae formation in anterior uveitis. - It does not address the underlying **inflammation** of intermediate uveitis, which is located more posteriorly. *Antibiotics* - **Antibiotics** are used to treat bacterial infections and are not indicated for **intermediate uveitis**, which is typically an **inflammatory** or **autoimmune disorder**. - They would be appropriate only if the uveitis were secondary to an **infectious cause**, which is not the primary characteristic of intermediate uveitis. *Topical steroids* - **Topical steroids** are effective for **anterior uveitis** but often fail to reach sufficient concentrations in the **vitreous** and **peripheral retina** to control the inflammation of intermediate uveitis. - **Intermediate uveitis** primarily affects the ciliary body, vitreous, and peripheral retina, requiring **systemic agents** for adequate therapeutic effect.

Q: Cycloplegics are used for the treatment of:

Iridocyclitis. ***Iridocyclitis*** - **Cycloplegics** paralyze the **ciliary muscle** and **iris sphincter**, reducing spasm and pain associated with inflammation in iridocyclitis. - They also help prevent the formation of **posterior synechiae**, adhesions between the iris and the lens. - This is the **primary therapeutic indication** for cycloplegics in inflammatory conditions. *Lens-induced glaucoma* - This condition is caused by **lens swelling** or **leakage of lens material**, leading to elevated intraocular pressure. - Treatment typically involves **surgical removal of the cataractous lens**, not cycloplegics. *Closed-angle glaucoma* - Cycloplegics are **CONTRAINDICATED** in closed-angle glaucoma as they cause **pupillary dilation**, which can precipitate or worsen angle closure. - The condition is characterized by **blockage of aqueous humor outflow** due to the iris obstructing the trabecular meshwork. - Treatment involves methods to open the angle, such as **laser iridotomy** or medications that **constrict the pupil** (miotics) or reduce aqueous humor production. *Chorioretinitis* - This is an **inflammation of the choroid and retina**, layers located at the back of the eye (posterior segment). - Treatment primarily involves **systemic anti-inflammatory agents** and antimicrobials if infectious. - Cycloplegics do not directly address posterior segment inflammation, though they may be used for symptomatic relief if anterior chamber reaction is present.

Q: Cyclosporine is used in the management of -

Disciform Keratitis. ***Disciform Keratitis*** - **Cyclosporine** is an immunosuppressant particularly valuable in managing **disciform keratitis**, which represents immune-mediated stromal inflammation typically associated with herpes simplex virus (HSV). - In disciform keratitis, the primary pathology is **immune-mediated** rather than active viral replication, making cyclosporine an ideal therapeutic choice to suppress the inflammatory response while avoiding steroid dependency. - **Topical cyclosporine 0.05% or 1%** is specifically indicated for this condition and represents a **characteristic indication** in ophthalmic practice. *Anterior Iridocyclitis* - While cyclosporine may be used in **chronic, recurrent, or steroid-dependent anterior uveitis**, it is not a first-line agent for typical acute anterior iridocyclitis. - First-line management involves **topical corticosteroids** and **cycloplegics**; cyclosporine is reserved for refractory cases. - Disciform keratitis remains the more characteristic and commonly tested indication for cyclosporine in ophthalmology. *Rhegmatogenous retinal detachment* - **Rhegmatogenous retinal detachment** is a surgical emergency caused by a retinal tear allowing vitreous fluid into the subretinal space. - Management is **surgical** (scleral buckle, vitrectomy, or pneumatic retinopexy); immunosuppressants like cyclosporine have no role in this mechanical problem. *Phacomorphic glaucoma* - **Phacomorphic glaucoma** is secondary angle-closure glaucoma caused by an intumescent (swollen) lens pushing the iris forward. - Treatment involves **IOP control** followed by **cataract extraction**; cyclosporine has no role in this mechanical lens-induced condition.

Q: What is the commonly used concentration of tetracaine for topical anesthesia in minor ophthalmic procedures?

0.5%. ***0.5%*** - **Tetracaine 0.5%** is the standard and most commonly used concentration for **topical ocular anesthesia** in minor ophthalmic procedures. - This concentration provides effective and rapid onset topical anesthesia for procedures like tonometry, foreign body removal, and gonioscopy with minimal side effects. *1%* - **Tetracaine 1%** is a higher concentration not typically used for routine topical ophthalmic anesthesia due to an increased risk of **epithelial toxicity** and other side effects. - While it would provide more potent anesthesia, its use is generally limited to specific cases where stronger anesthesia is needed and the benefits outweigh the risks. *2%* - **Tetracaine 2%** is an even higher concentration, rarely used in ophthalmology because of a significantly increased risk of **corneal damage** and other ocular surface complications. - This concentration is considered too strong for topical use in the eye and could lead to prolonged epithelial defects. *0.25%* - **Tetracaine 0.25%** is a lower concentration that may not provide sufficient depth or duration of anesthesia for most minor ophthalmic procedures. - While it would have a lower risk of toxicity, its **suboptimal anesthetic effect** makes it less commonly used than 0.5%.

Q: In a patient with acute anterior uveitis presenting with raised intraocular pressure, the PRIMARY treatment should be:

Topical steroids. ***Topical steroids*** - **Topical corticosteroids** are the primary treatment for **anterior uveitis** to reduce inflammation, which is the underlying cause of both the uveitis and often the raised IOP. - While IOP is elevated, managing the inflammation with steroids is crucial, as the inflammation itself can lead to secondary **IOP elevation** due to trabecular meshwork dysfunction or synechiae formation. *Topical beta-blockers* - **Topical beta-blockers** are used to lower intraocular pressure, but they do not address the underlying **inflammation** in acute anterior uveitis. - Using them alone without treating the inflammation can lead to progression of the uveitis and further ocular damage. *Cycloplegics* - **Cycloplegics** (e.g., atropine, cyclopentolate) are important adjuncts in acute anterior uveitis to relieve pain from ciliary spasm and prevent posterior synechiae formation by dilating the pupil. - They do not, however, treat the **inflammation** directly or primarily address the elevated intraocular pressure. *Miotics* - **Miotics** (e.g., pilocarpine) **constrict the pupil**, which can worsen symptoms in acute anterior uveitis by increasing ciliary body spasm and potentially increasing the risk of posterior synechiae formation. - They are contraindicated in acute anterior uveitis as they exacerbate pain and inflammation, and do not treat the underlying cause.

Question 1

Drug commonly used as immunosuppressive therapy for non-infectious uveitis is -

Accepted Answer

Cyclosporine

Answer

Methotrexate

Answer

Infliximab

Answer

Voclosporin

Question 2

Which of the following is a contraindication to topical steroids?

Accepted Answer

Dendritic ulcer

Answer

Herpetic stromal keratitis without epithelial defect

Answer

Elevated intraocular pressure

Answer

Non-infectious anterior uveitis

Question 3

Floppy iris syndrome is associated with usage of

Accepted Answer

Selective alpha-adrenergic antagonist

Answer

5 alpha reductase inhibitor

Answer

PDE-5 inhibitor

Answer

Anticholinergics

Question 4

What is a common side effect of long-term topical steroid use in the eye?

Accepted Answer

Cataract formation

Answer

Dry eye syndrome

Answer

Allergic conjunctivitis

Answer

Subconjunctival hemorrhage

Question 5

The percentage of atropine present in atropine drops as cycloplegic is:

Accepted Answer

1%

Answer

4%

Answer

2%

Answer

0.5%

Question 6

What is the drug of choice for treating intermediate uveitis?

Accepted Answer

Systemic steroids

Answer

Atropine

Answer

Antibiotics

Answer

Topical steroids

Question 7

Cycloplegics are used for the treatment of:

Accepted Answer

Iridocyclitis

Answer

Lens-induced glaucoma

Answer

Closed-angle glaucoma

Answer

Chorioretinitis

Question 8

Cyclosporine is used in the management of -

Accepted Answer

Disciform Keratitis

Answer

Phacomorphic glaucoma

Answer

Anterior Iridocyclitis

Answer

Rhegmatogenous retinal detachment

Question 9

What is the commonly used concentration of tetracaine for topical anesthesia in minor ophthalmic procedures?

Accepted Answer

0.5%

Answer

1%

Answer

2%

Answer

0.25%

Question 10

In a patient with acute anterior uveitis presenting with raised intraocular pressure, the PRIMARY treatment should be:

Accepted Answer

Topical steroids

Answer

Topical beta-blockers

Answer

Cycloplegics

Answer

Miotics

Ophthalmic Pharmacology — MCQs

Ophthalmic Pharmacology — MCQs

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