Cataract: Symptoms, Causes & Treatment

Cataract is a gradual clouding of the eye's natural clear lens, leading to progressive vision loss and reduced visual clarity. The lens normally focuses light onto the retina at the back of the eye to produce clear vision. When the lens is affected by various factors, proteins accumulate and the lens chemistry changes, causing cloudiness that gradually blocks light from reaching the retina properly.

Cataracts are one of the most common causes of vision impairment worldwide, particularly in people over 60 years old. In the Middle East and Jordan, it remains an important public health issue affecting quality of life and independence. Cataract development is usually slow, and patients may not notice symptoms in early stages. Early diagnosis and effective surgical treatment can restore clear vision and significantly improve the patient's quality of life.

There are several types of cataracts based on location of clouding (nuclear, cortical, subcapsular), and each may require a slightly different treatment approach. The good news is that modern cataract surgery (Phacoemulsification technique) is very safe and effective, with success rates exceeding 95%, and return to normal activities is usually rapid.

Cataract symptoms begin mild and progress gradually over time. In early stages, patients may notice no obvious vision change. As the disease progresses, symptoms become more noticeable and affect daily quality of life. Symptoms may vary slightly depending on cataract type and location in the lens, but general symptoms are similar in most patients regardless of age or gender.

• Blurry or cloudy vision: Gradual onset; vision appears as if looking through a dirty or fogged window.
• Reduced night vision and difficulty seeing in dim lighting: Patients struggle with night driving and walking in dark areas.
• Excessive light sensitivity and glare: Bright and direct lights bother the patient; reflections from surfaces cause discomfort.
• Double vision or multiple images: Patient may see multiple images of a single object.
• Frequent changes in glasses or contact lens prescription: Repeated need for glasses changes may be an early sign.
• Colors appearing yellowish or discolored: Colors may look more yellow or brown, especially in advanced stages.
• Halos around lights: Seeing colored circles around light sources at night.
• General vision loss progressing slowly: Patient may not notice gradual progression until suddenly noticing decreased vision.
• Difficulty reading and detailed work: Especially in poor lighting.
• Inability to see distant and near objects clearly: In advanced cases.

• Aging: The primary cause; over time, proteins accumulate and oxidize in the lens, causing gradual clouding especially after age 60.
• Excessive UV radiation exposure: Direct, intense sunlight over many years damages lens cells and accelerates cataract formation.
• Diabetes: High blood sugar affects lens metabolism and causes faster clouding than normal; cataracts may develop earlier in diabetic patients.
• Hypertension: Affects blood vessel health around the eye and accelerates cataract development.
• Smoking: Harmful chemicals in smoke oxidize lens cells and cause early clouding.
• Eye injuries and trauma: Direct blows to the eye or previous eye surgery may cause traumatic cataracts.
• Medications (especially corticosteroids): Prolonged oral or topical corticosteroid use significantly increases cataract risk.
• Malnutrition and dehydration: Deficiency of antioxidants and vitamins like C and E weakens lens protection against oxidation.

• Age over 60: Primary risk factor; risk increases significantly with advancing age.
• Family history: Having cataracts in the family increases likelihood of developing them.
• Uncontrolled diabetes: Especially with prolonged high blood sugar levels.
• Active or passive smoking: Continuous smoke exposure significantly increases risk.
• Excessive alcohol consumption: Alcohol affects lens metabolism and increases clouding.
• Obesity and sedentary lifestyle: Associated with increased inflammation and accelerate cataract development.
• Previous eye disease: Such as glaucoma or retinal detachment increase risk.
• Occupational heat exposure: Workers in foundries and metalwork face higher risk.
• Intense electronic device use without eye protection: May increase eye strain long-term.
• Vitamin and mineral deficiency: Especially vitamin E, zinc, and selenium.

Cataract diagnosis is based on comprehensive clinical examination by an ophthalmologist. Examination begins with patient's medical history and symptoms, followed by advanced practical and automated tests to confirm diagnosis and assess disease progression and impact on vision.

• Visual Acuity Test: Simple test reading letters on a chart from a certain distance, showing patient's current vision clarity.
• Visual Field Test: Measures how well patient sees objects around them on sides of vision.
• Slit-lamp Examination: Precise instrument giving magnified view of lens and eye's anterior structures, allowing detailed visualization of cloudiness location and extent.
• Intraocular Pressure (IOP) Measurement: Measured with special devices like tonometry to ensure no accompanying glaucoma.
• Dilated Fundus Examination: After dilating pupils with special drops, doctor examines retina and optic nerve for integrity.
• Refraction Test: Determines current glasses or contact lens needs.
• Ultrasound Biometry: Used if patient has very dense cataracts preventing fundus visualization; sound waves measure eye length before surgery.
• Static and dynamic light testing: Tests eye sensitivity to light and its impact.

Medications

• Eye drops: No reliable medications reverse or stop cataract progression once formed. Some drops may slow development in very early stages (e.g., antioxidant drops), but they don't cure the disease. Lubricating drops may relieve accompanying symptoms like dry eyes.

Procedures and Surgery

• Phacoemulsification (Phaco) Surgery: Gold standard and most widely used today. A precise device emitting ultrasonic waves is inserted through a tiny incision (2-3mm) in the cornea to fragment the clouded lens into tiny pieces, then gently suctioned out. The incision is so small it often requires no stitches.
• Femtosecond Laser Assisted Cataract Surgery (FLACS): Advanced phaco version using laser to make incisions and handle certain surgical steps, potentially improving outcomes in complex eyes.
• Intraocular Lens (IOL) Implantation: After removing the clouded natural lens, a permanent artificial lens is implanted inside the eye. Several types available:
  • Monofocal IOL: Provides clear vision at one distance only (far, near, or intermediate); patient may need glasses for reading or distance after surgery.
  • Toric IOL: Designed to correct astigmatism (uneven corneal curvature); improves vision quality in moderate to severe astigmatism cases.
  • Multifocal IOL: Provides clear vision at multiple distances (far, near, sometimes intermediate) simultaneously; may reduce glasses dependence but can cause halos or glare in some patients.
  • Extended Depth of Focus (EDOF) IOL: Provides good vision across a wide range of distances; middle ground between monofocal and multifocal.

Lifestyle Changes and Preventing Progression

• Avoid excessive sun exposure: Wear UV-protective sunglasses (UVA and UVB) when outdoors during daytime, especially in Jordan where sun is very strong.
• Improve diabetes control: If diabetic, keep blood sugar within normal ranges through medications, diet, and exercise.
• Control blood pressure: Check blood pressure regularly and take prescribed medications.
• Quit smoking: Smoking accelerates cataract development significantly; quitting reduces risk.
• Improve nutrition: Eat antioxidant-rich foods like colorful fruits and vegetables (berries, spinach, carrots) and fatty fish rich in omega-3 fatty acids.
• Reduce alcohol: Avoid excessive alcohol consumption.
• Maintain healthy weight: Reduce obesity through regular physical activity.
• Regular eye exams: Have eye exams annually or every two years after age 50 for early cataract detection and other issues.
• Protect eyes from injury: Wear protective glasses when working with sharp tools or in hazardous environments.

• Secondary Glaucoma: In rare cases, lens swelling can raise eye pressure, potentially causing permanent optic nerve damage and vision loss if not treated promptly.
• Intumescent Cataract: Clouded lens swelling can pressure internal eye angles and dangerously raise eye pressure.
• Severe vision loss and partial blindness: If untreated, cataracts can progress to complete or near-complete eye blindness.
• Surgical complications (rare but possible): Post-operative fluid leakage, intraocular infection (endophthalmitis), corneal damage, delayed retinal detachment. Most are very rare with experienced surgeons and treated successfully.
• Unstable vision after surgery: Some patients need longer periods for vision stabilization, or may require additional corrective procedures like glasses adjustment or LASIK later.
• Posterior Capsular Opacification (PCO): After surgery, the posterior capsule (holding the artificial lens) may become cloudy over time in some patients. This is easily treated with simple, safe laser surgery (YAG Laser Capsulotomy) in clinic.
• Patient dissatisfaction with visual result: Especially if choosing multifocal lenses, patient may notice halos or glare, or expectations may not fully materialize.
• Permanent vision loss (very rare): In exceptional cases from serious untreated complications.

• UV protection: Wear high-quality sunglasses providing 100% UV protection (UVA and UVB) when outdoors, especially in Jordan where sunlight is very strong. Wide-brimmed hat or umbrella helps too.
• Strict diabetes monitoring: If diabetic, keep blood sugar 80-130 mg/dL fasting and below 180 mg/dL after meals. HbA1c should be below 7%.
• Blood pressure control: Maintain blood pressure below 120/80 mmHg. Check regularly and take prescribed medications.
• Quit smoking and avoid smoke: Smoking nearly doubles cataract risk. Stop now and avoid secondhand smoke.
• Improve antioxidant nutrition: Eat colorful fruits and vegetables daily (oranges, carrots, spinach, blueberries, tomatoes) and fish 2-3 times weekly. Vitamins C and E, zinc, and selenium provide effective protection.
• Limit alcohol: If drinking, keep to moderate amounts (one drink daily for women, two for men).
• Regular physical activity: Exercise moderately like brisk walking 30 minutes daily, 5 days weekly. Exercise improves diabetes, weight, and blood pressure control.
• Regular eye exams: Everyone over 50 should have eye exams every 1-2 years. Those with risk factors (diabetes, hypertension, family history) need more frequent exams.
• Protect eyes from injury: Use safety glasses when working with sharp tools or in construction or heavy work.
• Maintain healthy weight: Obesity increases inflammation and cataract development. Keep BMI 18.5-24.9.