Question: subjective vertigo Can macular degeneration in only one eye cause dizziness?

Reference:
 Dizziness Overview Dizziness is a term used to describe a range of sensations, such as feeling faint, woozy, weak or unsteady. Dizziness that creates the false sense that you or your surroundings are spinning or moving is called vertigo. Dizziness is one of the more common reasons adults visit their doctors. Frequent dizzy spells or constant dizziness can significantly affect your life. But dizziness rarely signals a life-threatening condition. Treatment of dizziness depends on the cause and your symptoms. It's usually effective, but the problem may recur. Symptoms People experiencing dizziness may describe it as any of a number of sensations, such as: - A false sense of motion or spinning (vertigo) - Lightheadedness or feeling faint - Unsteadiness or a loss of balance - A feeling of floating, wooziness or heavy-headedness These feelings may be triggered or worsened by walking, standing up or moving your head. Your dizziness may accompanied by nausea or be so sudden or severe that you need to sit or lie down. The episode may last seconds or days and may recur. When to see a doctor Call 911 or seek emergency medical help if you experience dizziness with: - A sudden or severe headache - Ongoing vomiting - A sudden change in speech, vision or hearing - Stumbling or difficulty walking - Fainting - Chest pain or an irregular heart rate - Numbness or weakness - Shortness of breath - A high fever - A very stiff neck - A head injury - Seizures Consult with your doctor if you experience recurrent, sudden, severe dizziness or prolonged episodes of dizziness, faintness, lightheadedness or vertigo. Causes Dizziness has many possible causes, including inner ear disturbance, motion sickness and medication effects. Sometimes it's caused by an underlying health condition, such as poor circulation, infection or injury. The way dizziness makes you feel and your triggers provide clues for possible causes. How long the dizziness lasts and any other symptoms you have also help pinpoint the cause. Inner ear problems that cause dizziness (vertigo) Your sense of balance depends on the combined input from the various parts of your sensory system. These include your: - Eyes, which help you determine where your body is in space and how it's moving - Sensory nerves, which send messages to your brain about body movements and positions - Inner ear, which houses sensors that help detect gravity and back-and-forth motion Vertigo is the false sense that your surroundings are spinning or moving. With inner ear disorders, your brain receives signals from the inner ear that aren't consistent with what your eyes and sensory nerves are receiving. Vertigo is what results as your brain works to sort out the confusion. - Benign paroxysmal positional vertigo (BPPV). This condition causes an intense and brief but false sense that you're spinning or moving. These episodes are triggered by a rapid change in head movement, such as when you turn over in bed, sit up or experience a blow to the head. BPPV is the most common cause of vertigo. - Infection. A viral infection of the vestibular nerve, called vestibular neuritis, can cause intense, constant vertigo. If you also have sudden hearing loss, you may have labyrinthitis. - Meniere's disease. This disease involves the excessive buildup of fluid in your inner ear. It's characterized by sudden episodes of vertigo lasting as long as several hours. You may also experience fluctuating hearing loss, ringing in the ear and the feeling of a plugged ear. - Migraine. People who experience migraines may have episodes of vertigo or other types of dizziness even when they're not having a severe headache. Such vertigo episodes can last minutes to hours and may be associated with headache as well as light and noise sensitivity. Circulation problems that cause dizziness You may feel dizzy, faint or off balance if your heart isn't pumping enough blood to your brain. Causes include: - Drop in blood pressure. A dramatic drop in your systolic blood pressure - the higher number in your blood pressure reading - may result in brief lightheadedness or a feeling of faintness. It can occur after sitting up or standing too quickly. This condition is also called orthostatic hypotension. - Poor blood circulation. Conditions such as cardiomyopathy, heart attack, heart arrhythmia and transient ischemic attack could cause dizziness. And a decrease in blood volume may cause inadequate blood flow to your brain or inner ear. Other causes of dizziness - Neurological conditions. Some neurological disorders - such as Parkinson's disease and multiple sclerosis - can lead to progressive loss of balance. - Medications. Dizziness can be a side effect of certain medications - such as anti-seizure drugs, antidepressants, sedatives and tranquilizers. In particular, blood pressure lowering medications may cause faintness if they lower your blood pressure too much. - Anxiety disorders. Certain anxiety disorders may cause lightheadedness or a woozy feeling often referred to as dizziness. These include panic attacks and a fear of leaving home or being in large, open spaces (agoraphobia). - Low iron levels (anemia). Other signs and symptoms that may occur along with dizziness if you have anemia include fatigue, weakness and pale skin. - Low blood sugar (hypoglycemia). This condition generally occurs in people with diabetes who use insulin. Dizziness (lightheadedness) may be accompanied by sweating and anxiety. - Overheating and dehydration. If you're active in hot weather, or if you don't drink enough fluids, you may feel dizzy from overheating (hyperthermia) or from dehydration. This is especially true if you take certain heart medications. Risk factors Factors that may increase your risk of getting dizzy include: - Age. Older adults are more likely to have medical conditions that cause dizziness, especially a sense of imbalance. They're also more likely to take medications that can cause dizziness. - A past episode of dizziness. If you've experienced dizziness before, you're more likely to get dizzy in the future. Diagnosis If your doctor suspects you're having or may have had a stroke, are older or suffered a blow to the head, he or she may immediately order an MRI or CT scan. Most people visiting their doctor because of dizziness will first be asked about their symptoms and medications and then be given a physical examination. During this exam, your doctor will check how you walk and maintain your balance and how the major nerves of your central nervous system are working. You may also need a hearing test and balance tests, including: - Eye movement testing. Your doctor may watch the path of your eyes when you track a moving object. And you may be given an eye motion test in which cold and warm water or air are placed in your ear canal. - Head movement testing. If your doctor suspects your vertigo is caused by benign paroxysmal positional vertigo, he or she may do a simple head movement test called the Dix-Hallpike maneuver to verify the diagnosis. - Posturography. This test tells your doctor which parts of the balance system you rely on the most and which parts may be giving you problems. You stand in your bare feet on a platform and try to keep your balance under various conditions. - Rotary-chair testing. During this test you sit in a computer-controlled chair that moves very slowly in a full circle. At faster speeds, it moves back and forth in a very small arc. In addition, you may be given blood tests to check for infection and other tests to check heart and blood vessel health. Treatment Dizziness often gets better without treatment. Within a couple of weeks, the body usually adapts to whatever is causing it. If you seek treatment, your doctor will base it on the cause of your condition and your symptoms. It may include medications and balance exercises. Even if no cause is found or if your dizziness persists, prescription drugs and other treatments may make your symptoms more manageable. Medications - Water pills. If you have Meniere's disease, your doctor may prescribe a water pill (diuretic). This along with a low-salt diet may help reduce how often you have dizziness episodes. - Medications that reduce the dizziness. Antihistamines such as meclizine (Antivert) may offer short-term relief from vertigo. Anticholinergics help reduce dizziness. They include scopolamine skin patches (Transderm Scop). - Anti-nausea medications. Your doctor may prescribe a drug to provide immediate relief of nausea. Some of these can cause drowsiness. - Anti-anxiety medications. Diazepam (Valium) and alprazolam (Xanax) are in a class of drugs called benzodiazepines, which may cause addiction. They may also cause drowsiness. - Preventive medicine for migraine. Certain medicines may help prevent attacks of migraine. Therapy - Head position maneuvers. A technique called canalith repositioning (or Epley maneuver) usually helps resolve benign paroxysmal positional vertigo more quickly than simply waiting for your dizziness to go away. It can be done by your doctor, an audiologist or a physical therapist and involves maneuvering the position of your head. It's usually effective after one or two treatments. Before undergoing this procedure, tell your care provider if you have a neck or back condition, a detached retina or blood vessel problems. - Balance therapy. You may learn specific exercises to help make your balance system less sensitive to motion. This physical therapy technique is called vestibular rehabilitation. It is used for people with dizziness from inner ear conditions such as vestibular neuritis. - Psychotherapy. This type of therapy may help people whose dizziness is caused by anxiety disorders. Surgical or other procedures - Injections. Your doctor may inject your inner ear with the antibiotic gentamicin to disable the balance function. The unaffected ear takes over that function. - Removal of the inner ear sense organ. A procedure that's rarely used is called labyrinthectomy. It disables the vestibular labyrinth in the affected ear. The other ear takes over the balance function. This technique may be used if you have serious hearing loss and your dizziness hasn't responded to other treatments. Lifestyle and home remedies Dizziness usually goes away on its own. If you tend to experience repeated episodes of dizziness, consider these tips: - Be aware of the possibility of losing your balance, which can lead to falling and serious injury. - Avoid moving suddenly and walk with a cane for stability, if needed. - Fall-proof your home by removing tripping hazards such as area rugs and exposed electrical cords. Use nonslip mats on your bath and shower floors. Use good lighting. - Sit or lie down immediately when you feel dizzy. Lie still with your eyes closed in a darkened room if you're experiencing a severe episode of vertigo. - Avoid driving a car or operating heavy machinery if you experience frequent dizziness without warning. - Avoid using caffeine, alcohol, salt and tobacco. Excessive use of these substances can worsen your signs and symptoms. - Drink enough fluids, eat a healthy diet, get enough sleep and avoid stress. - If your dizziness is caused by a medication, talk with your doctor about discontinuing it or lowering the dose. - If your dizziness comes with nausea, try an over-the-counter (nonprescription) antihistamine, such as meclizine (Antivert) or one containing dimenhydrinate (Dramamine). These may cause drowsiness. Nondrowsy antihistamines aren't as effective. - If your dizziness is caused by overheating or dehydration, rest in a cool place and drink water or a sports drink (Gatorade, Powerade, others). 

Answer: Dizziness has many possible causes, including inner ear disturbance, motion sickness and medication effects. Sometimes it's caused by an underlying health condition, such as poor circulation, infection or injury. The way dizziness makes you feel and your triggers provide clues for possible causes. How long the dizziness lasts and any other symptoms you have also help pinpoint the cause. Inner ear problems that cause dizziness (vertigo) Your sense of balance depends on the combined input from the various parts of your sensory system. These include your: - Eyes, which help you determine where your body is in space and how it's moving - Sensory nerves, which send messages to your brain about body movements and positions - Inner ear, which houses sensors that help detect gravity and back-and-forth motion Vertigo is the false sense that your surroundings are spinning or moving. With inner ear disorders, your brain receives signals from the inner ear that aren't consistent with what your eyes and sensory nerves are receiving. Vertigo is what results as your brain works to sort out the confusion.