Progressive opacification of the crystalline lens — leading global cause of reversible blindness; surgery is curative.
Also known as: age-related cataract, senile cataract, nuclear sclerotic cataract, cortical cataract, posterior subcapsular cataract
Overview
Opacification of the crystalline lens that scatters light and reduces visual acuity. Age-related (senile) cataracts are the most common form and are classified morphologically as nuclear sclerotic, cortical, or posterior subcapsular (PSC); many patients have mixed types.
Epidemiology
Leading cause of reversible blindness worldwide and the most common cause of preventable blindness. By age 80, more than half of US adults have significant cataract or have undergone cataract surgery. Cataract surgery is the most commonly performed operation in the US.
Try two board-style Age-Related Cataracts questions
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Question 1EENTEasy
A 70-year-old female has gradual painless decreased visual acuity, glare in bright light, and difficulty driving at night. Examination reveals a diminished red reflex bilaterally. Which of the following is the most likely diagnosis?
AOpen angle glaucoma
BDiabetic retinopathy
CVitreous hemorrhage
DCataract
EMacular degeneration
Reveal answer & full explanation
Correct answer: D — Cataract
AOpen angle glaucoma
BDiabetic retinopathy
CVitreous hemorrhage
DCataract✓
EMacular degeneration
Why Cataract is correct
Cataract is opacification of the crystalline lens and the leading cause of reversible blindness worldwide
Symptoms: painless gradual decreased visual acuity, glare (bright lights, halos around headlights, difficulty driving at night), decreased contrast sensitivity
"Second sight" — a transient improvement in near vision — occurs with nuclear sclerotic cataracts
Examination findings: decreased red reflex and lens opacity visible on slit lamp
This patient's painless gradual visual decline with glare, night driving difficulty, and decreased bilateral red reflex is classic
Why the others are wrong
Open angle glaucoma — causes peripheral (not central or glare-related) visual field loss; red reflex is preserved
Macular degeneration — age-related macular degeneration (AMD) causes central scotoma; fundoscopy shows drusen and retinal pigment epithelium (RPE) changes, and the red reflex is typically preserved
Diabetic retinopathy — fundoscopy shows microaneurysms, hemorrhages, and exudates; the red reflex stays normal unless a vitreous hemorrhage causes sudden floaters and vision loss
Vitreous hemorrhage — blood in the vitreous does dim the red reflex, which makes this tempting, but vitreous hemorrhage causes sudden painless vision loss with floaters, usually in one eye and often from proliferative diabetic retinopathy or a retinal tear; gradual bilateral decline with glare and night-driving difficulty points to lens opacity
Cataract types: nuclear sclerotic (yellow-brown, central, age-related), cortical (spoke-wheel pattern), posterior subcapsular (associated with steroids and diabetes, faster progressing)
Treatment: phacoemulsification with intraocular lens implantation when activities of daily living (ADL) are impacted; excellent prognosis
Question 2EENTEasy
A 72-year-old man reports a gradual, painless decline in his vision over the past two years. He describes glare and halos around oncoming headlights that make night driving difficult, faded colors, and a need for frequent eyeglass prescription changes. He has a 40-pack-year smoking history and type 2 diabetes. On examination, best-corrected visual acuity is 20/60 and does not improve further with refraction. Direct ophthalmoscopy reveals a diminished red reflex, and slit-lamp examination shows opacification of the central lens. Which of the following is the most likely diagnosis?
AAge-related nuclear cataract
BPosterior subcapsular cataract
CAge-related cortical cataract
DAge-related macular degeneration
EProgressive open-angle glaucoma
Reveal answer & full explanation
Correct answer: A — Age-related nuclear cataract
AAge-related nuclear cataract✓
BPosterior subcapsular cataract
CAge-related cortical cataract
DAge-related macular degeneration
EProgressive open-angle glaucoma
Why Age-related nuclear cataract is correct
Gradual painless vision loss with glare and halos, faded colors, and frequent prescription changes (myopic shift / "second sight") is the classic symptom cluster of age-related lens opacification.
The objective signs localize the problem to the lens: a diminished red reflex and slit-lamp opacification of the central lens, with acuity that does NOT improve with refraction, rather than a simple refractive error. The myopic shift, faded colors, and heavy smoking history point to the nuclear type, whose central opacity is characteristically yellow-brown (brunescent) on slit lamp.
Age over 60 is the most important risk factor, and smoking and diabetes are additional well-established contributors seen in this patient.
Why the others are wrong
Posterior subcapsular cataract - PSC also causes glare, halos, and a dimmed red reflex and is associated with diabetes, but it typically affects younger patients and corticosteroid users, progresses over months, impairs near vision and vision in bright light disproportionately, and does not cause a myopic shift; on slit lamp it is a granular plaque just in front of the posterior capsule. A two-year course with frequent prescription changes and heavy smoking favors nuclear sclerosis.
Progressive open-angle glaucoma - is painless but causes peripheral field loss with optic disc cupping and possibly elevated intraocular pressure, with a clear lens and a normal red reflex.
Age-related macular degeneration - produces central distortion (metamorphopsia) and drusen on dilated macular exam, not a diminished red reflex or a central lens opacity; the vision loss is central rather than glare-dominant.
Age-related cortical cataract - cortical cataract also causes glare and halos and is linked to diabetes, but it begins as peripheral wedge-shaped (spoke-like) opacities in the lens cortex rather than a central opacity, and it does not typically cause the myopic shift and faded, yellowed color perception of nuclear sclerosis; heavy smoking is most strongly tied to the nuclear type.
Additional high-yield points
Uncorrected refractive error improves with pinhole testing or refraction and shows a clear lens with a normal red reflex.
Treatment is cataract extraction with intraocular lens implantation once visual impairment limits daily activities such as night driving.
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Chronic corticosteroid use (topical, inhaled, or systemic) — PSC
Chronic UV-B light exposure
Trauma (traumatic cataract — often rosette pattern)
Intraocular inflammation (uveitis), prior intraocular surgery
Ionizing radiation
Hypocalcemia, Wilson disease, myotonic dystrophy, atopic dermatitis
Genetic / congenital (rubella, galactosemia in pediatric)
Pathophysiology
Oxidative stress, protein cross-linking, and altered lens fiber organization disrupt the transparency of the crystalline lens. Nuclear sclerosis causes hardening and yellow/brown discoloration of the central lens; the sclerotic nucleus has a higher refractive index, which increases lens converging power and produces a myopic shift ('second sight': a presbyope can read without glasses again), unlike presbyopia, which is loss of accommodation from lens stiffening that worsens near vision. Cortical opacities are wedge-shaped (spoke-like) in the periphery and cause glare. Posterior subcapsular cataracts develop just anterior to the posterior capsule and disproportionately impair near vision and vision in bright light.
Clinical presentation
Symptoms
Gradual painless decrease in vision over months to years
Glare and halos around lights, especially at night
Difficulty with night driving (oncoming headlights)
Decreased contrast sensitivity, faded colors
Frequent prescription changes; 'second sight' (near vision temporarily improves with myopic shift from nuclear sclerosis)
PSC: prominent glare and poor near vision in bright light
Signs / physical exam
Decreased visual acuity not improved with refraction beyond a point
Diminished red reflex on direct ophthalmoscopy
Lens opacity on slit-lamp examination (graded clinically 1-4+; the LOCS III photographic scale is used mainly in research)
Brunescence of nucleus in advanced nuclear sclerosis
Cortical spokes peripherally
Posterior subcapsular plaque just anterior to posterior capsule
Classic findings
Painless gradual vision loss, glare, and diminished red reflex in an older patient.
Differential diagnosis
Refractive error — Improves with refraction; clear lens
Age-related macular degeneration — Central distortion (metamorphopsia), drusen on exam; cataract surgery may not restore central acuity
Open-angle glaucoma — Painless peripheral field loss; cupped disc; IOP may be elevated
Diabetic retinopathy — Macular edema, hemorrhages on exam; A1c known
Smoking cessation; control diabetes; minimize unnecessary systemic/inhaled corticosteroids
UV protection with sunglasses to slow progression
Second-line / adjunct
Cataract surgery — phacoemulsification with intraocular lens (IOL) implantation — indicated when cataract causes visual impairment that interferes with daily activities or driving, regardless of Snellen acuity; outpatient under topical/local anesthesia
IOL options: monofocal (most common), toric (corrects astigmatism), multifocal/EDOF (presbyopia correction at cost of nighttime glare/halos)
Femtosecond laser-assisted cataract surgery — alternative technique; no clear superiority for visual outcomes
Combined surgery with MIGS in patients with coexisting glaucoma
Posterior capsular opacification ('after-cataract') in 20-40% — treated with YAG laser capsulotomy
Endophthalmitis 0.05-0.2% — vision-threatening; managed per EVS
PANCE pearls
Visual impact, not Snellen acuity alone, drives the decision for cataract surgery — glare disability and reading difficulty matter.
Nuclear sclerosis classically produces a myopic shift ('second sight'); cortical cataracts cause prominent glare; posterior subcapsular cataracts disproportionately worsen near vision and bright-light vision and are associated with steroids and diabetes.
A diminished red reflex in any age is abnormal — in children, leukocoria warrants urgent evaluation for retinoblastoma.
Coexisting macular disease (AMD, diabetic macular edema) limits the visual gain from cataract surgery — counsel patients about realistic expectations.
Endophthalmitis after cataract surgery is rare but vision-threatening; the Endophthalmitis Vitrectomy Study (EVS) guides vitreous tap + intravitreal antibiotics ± vitrectomy.
References
AAO 2021 — American Academy of Ophthalmology. Cataract in the Adult Eye Preferred Practice Pattern. Ophthalmology 2022;129(1):P1-P126
EVS — Endophthalmitis Vitrectomy Study Group. Results of the Endophthalmitis Vitrectomy Study. Arch Ophthalmol 1995;113(12):1479-1496
AREDS Report No. 5 — Age-Related Eye Disease Study Research Group. Risk factors associated with age-related nuclear and cortical cataract: a case-control study in the Age-Related Eye Disease Study, AREDS Report No. 5. Ophthalmology 2001;108(8):1400-1408
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