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Doctor :: SITE LAST UPDATED: Oct 30, 2008  
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James A. Roberts, MD
Tiffany Torrans, OD
Ask The Experts - Questions & Answers
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ASK THE EXPERTS

 By: Dr. Joel K. Shugar, MD, MSEE
        Dr. Tiffany Torrans, OD

Q:  What causes an ocular migraine — a migraine aura without the headache?  Is
it a sign of something serious?

 A:  A migraine aura without headache, also known as acephalgic migraine, is not uncommon among sufferers of classic migraine (migraine headache associated with aura).  The reason behind this the identical vasospasm and vasodilation that causes migraine headache.  The retina, the tissue in the eye that converts light into vision, is neural tissue that can really be considered to be part of the brain, so it is subject to the same types of phenomena that affect other parts of the brain.   Occasional to rare ocular migraines are not particularly serious, however those occurring more frequently should be evaluated by an ophthalmologist to consider whether prophylaxis or treatment should be initiated.

Q:  Why during a LASIK procedure would you block a tear duct?

 A: Tear drainage ducts are blocked with either a dissolvable plug or one designed to stay in place until removed in order to retain more tears in the eye.  This is performed to treat dry eye, which should be done well in advance of a LASIK procedure in order to achieve best results.  Sometimes eyes that don't appear dry prior to LASIK can temporarily develop dryness following LASIK, which typically resolves over the ensuing 3-6 months.  Should an eye appear significantly dry following LASIK, a plug should be placed in order to improve ocular lubrication.  I prefer to aggressively treat dry eye well in advance of LASIK surgery, so I do not routinely block tear ducts during the LASIK procedure but will do so if necessary postoperatively.

Q:  What causes pink eye?

 A: There are innumerable causes of red eyes, which are best evaluated by an ophthalmologist.  "Pink eye" is the common name for epidemic keratoconjunctivitis, which is, a highly contagious infection caused by a virus, most typically of the adenovirus family.  It usually starts in one eye and then affects the fellow eye about 24 hours later.  The infection is characterized by red, watering eyes that are uncomfortable, scratchy and sensitive to light.  Antibiotics are not effective against viral infection, and steroid treatment can cause what would have been a self-limited infection to become a chronic problem with steroid-dependency.  If one truly has pink eye one is highly contagious for up to 10 days and family members should exercise great care to avoid contact with towels and any other household items that may carry the infection.  Other causes of red eyes include bacterial infection, inflammation, allergy, autoimmune problems and many other potential causes, so a thorough evaluation by an ophthalmologist, is key to proper diagnosis and treatment.

Q:  What are floaters?  Where do they come from and what does that mean in regards to the overall health of my eye?

 A:  Four fifths of the volume of the eye is occupied by the vitreous cavity, which fills the space between the lens and the retina.  Normally this space is filled with vitreous humor which is a clear substance having the consistency of jelly.  With increasing age this jelly-like substance liquefies, and floaters usually represent opacities floating within the vitreous.  In most cases these are not cause for worry.  However, as the vitreous liquefies its volume decreases, and eventually it often loses sufficient volume that it no longer takes up enough space to fill the vitreous cavity (just picture a cup of Jell-O turning to liquid; its volume would contract).  When this happens the vitreous can pull off of the back wall of the eye, an even known as a posterior vitreous detachment, or PVD, which usually causes at least one large, new, spider-shaped floater which is where the vitreous had been attached to the optic nerve and is not optically clear.  Sometimes, during a PVD the vitreous can exert traction upon the retina, causing flashes of lighter photopsia.  Such symptoms warrant urgent exam by an ophthalmologist since they can be a sign of tearing of the retina at the time of vitreous detachment.  Sudden appearance of numerous floaters also mandates urgent exam by an ophthalmologist, since this can represent bleeding inside the vitreous cavity, such as when a retinal tear causes a tear in a retinal blood vessel.  Diabetics are also at high risk of bleeding into the vitreous cavity, and every diabetic should see an ophthalmologist (an eye-MD) at least yearly for a comprehensive evaluation.  If a retinal tear or bleeding diabetic neovascular vessel goes undetected and untreated, this can lead to retinal detachment, which appears as a curtain coming across the vision from any direction with very foggy or no vision on one side of the curtain while vision on the other side is still relatively preserved.  A retinal detachment is a medical emergency and requires immediate evaluation and treatment.  Only an ophthalmologist, a medical doctor with specialty training in diagnosis and treatment of eye related disorders, is properly trained to diagnose and treat such emergencies as bleeding inside the eye, retinal tears and retinal detachment.

 
Q:  I am experiencing a type of double vision in one of my eyes, where the thing I am looking at is higher visually in one eye than the other. What causes this?

A: Double vision in one eye while the other eye is closed or occluded is known as monocular diplopia.   Possible causes include untreated refractive error (no or improper glasses), cataract and retinal or optic nerve disease.  You should have a comprehensive evaluation by an ophthalmologist, an eye-MD, right away. 


Q:  Can any nearsighted person wear contact lenses, no matter how high their prescription?

A: Most nearsighted or myopic patients with minor astigmatism and healthy corneas are capable of being fit into contact lenses. The strength of the prescription does not exclude patients because contacts are available in a wide range. For the few patients that do not fall within the soft contact lens parameters the option of gas permeable lenses should be discussed. I find most moderate to severely myopic patients have better peripheral vision with their contacts versus spectacles. My recommendation for the nearsighted patient with a high prescription that may become intolerable to contacts or elect another option is a new surgical technique known as ICL or implantable contact lenses.


Q: What causes cataracts?

 A:  Cataracts, which represent clouding of the natural lens inside the eye, are caused by changes in the proteins making up the lens.  These changes occur in everyone as part of the natural aging process, with much of the variability in rate due to genetics.  Smoking, exposure to excessive sunlight, diabetes and medications such as prednisone and diet deficient in antioxidant vitamins C and E all accelerate these changes.  Most people have some degree of clouding of the lens once they reach their 50's, and if not before then this often becomes visually significant in one's 60's or 70's.  Typical symptoms of cataracts are blurred vision with activities such as reading, driving (especially at night), increasing glare and frequent changes in glasses prescription.  Fortunately cataract surgery can now be performed without shots, stitches or patches - "Shugarcaine" is the only anesthetic designed for intraocular use, which greatly increases the safety and comfort of the no shot procedure.  Additionally we now have premium lenses for use at the time of cataract surgery that can restore excellent vision without glasses at near as well as distance, allowing for a much more youthful higher quality of vision.

Q:  Why does eyesight deteriorate with age?

 A: Eyesight deteriorates with age for many reasons.  The first change people typically notice is the loss of near vision that becomes significant in the mid 40's.  People who didn’t need any glasses beforehand, require reading glasses while those already in glasses require bifocals or progressives.  This condition, known as presbyopia, results from a loss of flexibility of the lens inside the eye and is a universal constant of human aging.  This process continues throughout middle age and this lens also develops progressive clouding, a condition known as cataract.  This causes a loss in clarity of vision not fully corrected by glasses, typically starting with glare when driving at night, trouble reading fine print, eyes fatiguing and watering after reading for a few minutes, frequent changes of glasses prescription and other similar symptoms.  The time to have cataracts removed is when these symptoms become problematic.  Cataract surgery can be performed without shots, stitches, patches or even an IV as a very short same day procedure that typically results in instantaneous or very rapid visual recovery.  Premium lens implants are now available that will not only correct distance vision after cataract surgery but will allow each eye to see distance, intermediate and near without glasses, resulting in a more youthful quality to vision.  Finally, diseases such as age-related macular degeneration and glaucoma become increasingly prevalent with increasing age. 


Q:  What would cause pupil dilation in a normally healthy person with no medical conditions and taking no medications?

A: Unilateral pupillary dilation is known as a tonic pupil.  Trauma is the most common cause.  Other causes can include viral illness, diabetes, syphilis and giant cell arteritis.  When the cause cannot be identified, the condition is termed Adie's tonic pupil, which is most common in young women.
 

Q:  I recently underwent cataract surgery. Will the artificial lens that was placed in my eye wear out or need to be replaced?

A:   In the vast majority of cases, the artificial lens placed in the eye following cataract surgery will last for the remainder of a person's life.  The need for intraocular lens exchange is quite rare, and is usually associated with either complications that occurred during the original cataract surgery or conditions such as Pseudoexfoliation that are associated with progressive weakness of the fibers supporting the lens, resulting in late dislocation.  However; quite frequently months or years after cataract surgery the membrane, in which the lens is encased can develop clouding as part of the natural healing process.  This clouding is easily cleared with a single YAG laser treatment that can be done at the same time as an office visit and which almost never needs to be repeated

Q:  I'm 55 and it seems to take longer for my eyes to adjust focus after doing close up editorial work. Is this the sign of a potential problem?

 A:  If you are 55 years old and able to do close up editorial work without glasses you are doing fantastically well!  Our ability to shift focus from distance to near is called accommodation and starts decreasing from the time of birth.  For most people, this age-related decline (called presbyopia) becomes significant by the mid 40's, and those who see well at distance without glasses require reading glasses, while those who are in glasses for distance require bifocal or progressive lenses.  A few fortunate individuals are able to make it into their 50's before reading glasses become necessary but eventually this happens to everyone.  Consider yourself fortunate.

Q:  What are the chances of retinal detachment following cataract surgery?
Is laser surgery necessary for nearsightedness?

A:  The chances for developing retinal detachment after cataract surgery vary tremendously based upon the preoperative refractive status, age and gender of the patient as well as whether or not there were complications during surgery.  A person who was farsighted or without much focusing error prior to surgery and who underwent uncomplicated surgery would have extremely remote chances for developing retinal detachment postoperatively.  The combination of factors posing the greatest risk are high nearsightedness preoperatively (typically too nearsighted to be able to even read without glasses), male gender, young age and the occurrence of operative complications such as posterior capsular rupture and/or vitreous loss.  Advanced surgical techniques such as microincision phacoemulsification surgery with capacity to minimize intraocular pressure fluctuations during surgery may further reduce risks of postoperative detachment.  For these reasons it is particularly important to choose a highly experienced cataract surgeon who uses the latest generation of phacoemulsification equipment, such as the Alcon Infinity system, particularly if a patient has one or more risk factors for retinal detachment or for other surgical complications (such as a history of prior ocular surgery or conditions such as glaucoma or diabetes).

 There are many options for correcting nearsightedness.  Laser surgery is the most common and well known, and is typically the most appropriate technique for younger patients without corneal abnormalities requiring correction of mild to moderate nearsightedness.  LASIK is the most common type of laser vision correction, and in many cases WaveFront-driven LASIK offers the potential to correct vision shaper than glasses or contacts by correcting errors of the eye that can’t be corrected by optical means.  In cases of sever nearsightedness or in patients whose corneas aren’t optimal for LASIK, the implantable contact lens (ICL) provides far superior outcomes.  For others, lens-based surgery will offer the best results.  Technology and surgeon experience is of critical importance to obtain the best outcome and to select the right procedure, so one should select a surgeon with extensive experience with all of these modalities and who has advanced equipment such as Orbscan to ensure corneas are optimally suited for LASIK and WaveFront correction capabilities.

 Q: My eyes constantly twitch, I don’t seep enough.  I have eye drops from my eye center but they still twitch and always feel heavy. Can lack of sleep really keep this going?

 A:   Twitching of the eyelids is a symptom of a condition known as blepharospasm.  Initial treatment of blepharospasm consists of improving the quantity and quality of tears.  It sounds like only part of the problem has been treated, since you have been given tear drops but do not mention any other treatment.  Yes, lack of sleep can contribute to blepharospasm but there is likely an underlying issue or issues with your ocular surface.  If first line treatment fails, botox is used to relieve the spasms. 

Q: Why is it that one of my pupils is larger than the other? Would I need to take medicine to reduce the size or have surgery?

 A: Anisocoria, or pupils that are differently sized, can result from one pupil being abnormally small or from the other pupil being abnormally large.  An abnormally small pupil may be due to Horner's syndrome, which can be caused by a variety of problems ranging from trauma to aortic or carotid dissection, tuberculosis, Pancoast's tumor, cluster migraine headache, or neck or thyroid surgery.  An abnormally large pupil can be due to Adie's syndrome (sometimes caused by bacterial or viral infection) or something as serious as an aneurysm.  There are many other causes for unequal pupils, some of which are serious and others benign.  You should see a qualified ophthalmologist, an eye-MD who has been through medical school and then spent at least 4 additional years of specialty training in medicine or surgery and then ophthalmology for an accurate diagnosis.  Regarding treatment, Adie's pupil can often be treated with medication while pupils that are too small can be enlarged using laser surgery.  In rare cases (usually associated with trauma), pupillary abnormalities are best addressed with intra-ocular surgery.

Q: Is there a corrective surgery for "crossed eyes" If so, is it successful and how long is the healing process?

 A: Crossed eyes, or esotropia, can be corrected surgically.  If an infant is noted to have crossed eyes, it is vital to have the child evaluated by a pediatric ophthalmologist immediately so this problem can be corrected as soon as possible.  The earlier in life crossed eyes are straightened, the higher the likelihood the eyes will work together to provide true binocular vision.  Ideally this will happen within the first year or so of life.  Once a child is 3-4 years old, straightening the eyes will not provide binocular vision but is still important to avoid the social stigma associated with esotropia.  Most surgeons report about an 80% success rate with initial surgery, with most of the remaining patients improved by a second procedure.

Q: My 18-month old son has puffy eyes. His eyes are not watery at all. he is getting plenty of sleep and does not have a cold? What could contribute to this and what should I do?

A: By puffy eyes I assume you are referring to his eyelids.  Start by having his pediatrician test him for allergies.  If nothing turns up on this evaluation your next stop should be a pediatric ophthalmologist

 

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