Question 1

The client’s eyes, tested with the use of a Snellen chart, show 20/40 vision in the right eye and 20/30 in the left eye. How should the nurse interpret these results?

Accepted Answer

Answer reason: Snellen acuity compares the patient’s vision at 20 feet to what a person with normal vision can read at that distance. A larger denominator reflects worse visual acuity because the patient must be closer to see what a normal eye can see farther away. Therefore 20/30 indicates better acuity than 20/40, making the left eye closer to normal than the right. Snellen findings do not measure intraocular pressure or diagnose glaucoma or astigmatism; those require tonometry and refraction testing, respectively.

Question 2

When using a Snellen alphabet chart, a nurse records a client’s vision as 20/40. Which statement best describes 20/40 vision?

Accepted Answer

Answer reason: Snellen notation expresses distance visual acuity as testing distance over the distance at which a person with normal acuity can read the same line. A 20/40 result indicates reduced distance acuity because the client must be 20 feet away to read what a normal eye can read at 40 feet. Legal blindness is typically defined around 20/200 or worse in the better eye with correction, so this finding does not meet that threshold. The alternative phrasing that reverses the distances would imply better-than-normal acuity (e.g., 40/20 conceptually), which is incorrect.

Question 3

A 74-year-old client is seen by the physician for treatment of cataracts. The nurse teaches the client about the signs and symptoms of cataracts. Which statement by the client indicates that he understands the teaching?

Accepted Answer

Answer reason: Cataracts cause progressive lens opacity that scatters light and reduces the quality of images reaching the retina. This produces classic symptoms such as blurred vision, glare, reduced contrast, and changes in color perception (often yellowing or fading) with visual distortion. The correct statement reflects expected manifestations rather than improvement from the cataract itself. A common misconception is that vision or night driving would improve; in reality, glare and poor night vision typically worsen until the cataract is treated.

Question 4

An 8-year-old child is seen at the clinic with complaints of pain, pustular drainage of the eyes, and sensitivity to light. Upon assessment, the nurse observes reddened, watery eyes. Based on the initial data, these symptoms are indicative of?

Accepted Answer

Answer reason: Keratitis (corneal inflammation/infection) commonly presents with red, watery eye, significant pain, and light sensitivity, and may have purulent discharge if infectious. In contrast, uncomplicated conjunctivitis typically causes irritation/grittiness and discharge but usually not marked photophobia. Ophthalmia neonatorum is conjunctivitis occurring in newborns, which does not fit an 8-year-old child.

Question 5

High concentration of oxygen administration in premature infants can cause?

Accepted Answer

Answer reason: This process leads to retinopathy of prematurity, historically termed retrolental fibroplasia, which can progress to scarring and retinal detachment. Respiratory distress syndrome is primarily caused by surfactant deficiency rather than excess oxygen exposure. Apnea of prematurity is due to immature respiratory control centers and is not a direct complication of administering high oxygen concentrations.

Question 6

Eye redness indicates…?

Accepted Answer

Answer reason: Conjunctivitis classically presents with conjunctival injection, tearing, foreign-body sensation, and sometimes discharge, making it the most direct fit for the symptom described. Diabetes is associated with retinal microvascular disease rather than acute external redness, and vertigo is a vestibular symptom unrelated to ocular surface findings. Parasitic worms are not a typical primary cause of isolated eye redness in standard clinical teaching for this type of question.

Question 7

Which disorder of close-vision is common in older adults?

Accepted Answer

Answer reason: This produces difficulty with close vision (reading) that typically begins in midlife and progresses with age. In contrast, myopia is distance-vision impairment and hyperopia is a refractive error not specifically driven by age-related loss of accommodation. Amblyopia is reduced vision from abnormal visual development, most commonly presenting in childhood rather than older adulthood.

Question 8

A child with which condition will be nearsighted?

Accepted Answer

Answer reason: This produces blurred distance vision with relatively better near vision, which defines myopia. Hyperopia is the opposite refractive error (farsightedness), where images focus behind the retina. Amblyopia is decreased vision from abnormal visual development, and presbyopia is age-related loss of accommodation, making them inconsistent with the definition of nearsightedness.

Question 9

Exophthalmos?

Accepted Answer

Answer reason: The defining feature is forward displacement/proptosis that makes the eye appear prominent. This is a terminology/definition question rather than a clinical management decision. The other options describe findings in different organ systems and do not match the ocular anatomic change implied by the term.

Question 10

Which part of the eye is a transparent membrane responsible for focusing incoming light onto the retina?

Accepted Answer

Answer reason: Because it is transparent and has a fixed curvature, it is the primary structure described as a “transparent membrane” for focusing incoming light. The lens also focuses light but is not a membrane and mainly fine-tunes focus via accommodation. The iris and pupil regulate the amount of light entering rather than focusing it.

Question 11

A nurse is caring for a patient who has had a loss of central vision. The nurse understands this is a sign of which eye disorder?

Accepted Answer

Answer reason: This pattern fits age-related macular degeneration, which presents with blurred or distorted central vision and difficulty reading/recognizing faces. In contrast, open-angle glaucoma classically causes progressive peripheral visual field loss (“tunnel vision”) rather than central loss initially. Retinal detachment more often presents with flashes, floaters, and a “curtain” over part of the visual field, not isolated central vision loss as the hallmark.

Question 12

Which part of the eye controls the amount of light entering?

Accepted Answer

Answer reason: In bright light it constricts the pupil to reduce light entry, and in dim light it dilates to increase light entry. The lens primarily changes shape for accommodation (focusing), not light regulation. The cornea is the main refractive surface and the retina is the sensory layer that detects light rather than controlling its entry.

Question 13

During a nursing assessment, the client states he is 70 years old and has a history of staphylococcus infections, increased intraocular pressure, and blurred vision. The nurse concludes that which item reported by the client is a risk factor for the development of cataracts?

Accepted Answer

Answer reason: Advanced age is the strongest and most classic risk factor, making the client’s age (70) directly relevant to cataract development. Increased intraocular pressure is primarily associated with glaucoma rather than being a causal risk factor for cataracts. Blurred vision is a symptom that cataracts can cause, but symptom duration itself does not function as an independent etiologic risk factor.

Question 14

Administration of oxygen to neonates may most likely cause?

Accepted Answer

Answer reason: This condition can progress to scarring and potential retinal detachment with visual impairment if not prevented by careful oxygen titration. The other options are not the classic oxygen-toxicity complication pattern in neonates, whereas retinopathy is specifically associated with hyperoxia exposure. Clinically, maintaining target oxygen saturation ranges and avoiding prolonged hyperoxia are key preventive measures in neonatal care.

Question 15

Laser beam is used for treatment of...?

Accepted Answer

Answer reason: This is a core principle behind common ophthalmic procedures such as retinal photocoagulation for diabetic retinopathy/retinal tears and laser iridotomy or trabeculoplasty for glaucoma. The eye is uniquely suited to laser therapy because light can be focused through transparent media to target specific retinal or anterior segment structures. While lasers can also be used in oncology and urology, the classic single-best association in basic medical/nursing science MCQs is ophthalmic treatment.

Question 16

Which cell disorder in our body is responsible for colour blindness?

Accepted Answer

Answer reason: Color blindness most commonly results from inherited defects or absence of one or more cone types (e.g., red/green cone pigment abnormalities), leading to impaired discrimination of colors. WBCs and red blood cells do not participate in visual phototransduction. While neurons transmit visual signals, the primary deficit in typical color blindness is at the level of cone photoreceptor function.

Question 17

What is the name of the transparent layer at the front of the eye?

Accepted Answer

Answer reason: The cornea is the transparent “window” at the very front of the globe through which light first enters and is focused. The retina is a light-sensing neural layer lining the back of the eye, not the front. The sclera is the opaque white outer coat, and the iris is a pigmented diaphragm that controls pupil size, neither of which is transparent.

Question 18

What is the name of the gland that produces tears to lubricate the eye?

Accepted Answer

Answer reason: The lacrimal gland, located superolaterally in the orbit, produces most reflex tears and contributes to basal tearing, helping prevent dryness and epithelial injury. Salivary glands produce saliva for oral digestion and lubrication, not ocular tears. Sweat glands regulate thermoregulation via perspiration, and the thyroid gland regulates metabolism via hormones rather than external secretions like tears.

Question 19

Which type of photoreceptor cells are responsible for color vision?

Accepted Answer

Answer reason: Cones provide this function via three cone types (S, M, L) that mediate trichromatic color discrimination and high visual acuity, especially in bright light and in the fovea. Rods are specialized for dim-light (scotopic) vision and do not encode color. Bipolar and ganglion cells are downstream retinal neurons that relay and process signals but are not the primary photoreceptors responsible for color detection.

Question 20

Which part of the eye regulates the amount of light that enters?

Accepted Answer

Answer reason: In bright light, the sphincter pupillae constricts the pupil to reduce retinal illumination; in dim light, the dilator pupillae enlarges the pupil to increase light entry. The pupil itself is only an opening and does not actively regulate its size. The lens primarily changes shape for accommodation, and the retina is the sensory layer that detects light rather than controlling how much enters.

Question 21

The commonest cause of blindness due to NCD is?

Accepted Answer

Answer reason: Persistent hyperglycemia damages retinal microvasculature, causing capillary leakage, ischemia, neovascularization, and vision loss. Among the listed choices, only this condition is an NCD-related retinal end-organ complication; cataract and glaucoma are major causes of blindness but are not specifically categorized as NCD-driven causes in this framing. The question’s wording targets the major blindness cause attributable to NCDs rather than overall global blindness causes.

Question 22

A person with hypermetropia ...?

Accepted Answer

Answer reason: Hypermetropia (farsightedness) occurs when the eye’s refractive power is insufficient or the eyeball is relatively short, causing light rays from near objects to focus behind the retina. This makes near vision blurred while distance vision is relatively clearer, especially in younger patients with good accommodation. Therefore the option describing difficulty seeing nearby objects aligns with the refractive error’s core mechanism. By contrast, difficulty seeing distant objects is characteristic of myopia, not hypermetropia.

Question 23

Which of the following scores for distance visions indicates the patient with the poorest vision?

Accepted Answer

Answer reason: Snellen acuity expresses what the patient can read at 20 feet compared with what a person with normal vision can read at a given distance. A larger denominator (with a fixed numerator of 20) indicates worse distance visual acuity because the patient must be closer to see what a normal eye sees farther away. Thus 20/100 reflects markedly reduced vision compared with values near or better than 20/20. Options with denominators of 20 (or smaller) indicate normal or better-than-normal acuity, and a value like 200/20 is not a standard way to report distance acuity and would not represent poorer vision than 20/100 in typical clinical notation.

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Ophthalmology (Eye) Practice Test 5

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