retinal detachment
Definition
Retinal detachment is a disorder of the eye in which the retina peels away from its underlying layer of support tissue. Initial
detachment may be localized, but without rapid treatment the entire retina may detach, leading to vision loss and
blindness. It is a medical emergency.
The retina is a thin layer of light-sensitive tissue on the back wall of the eye. The optical system of the eye focuses light on
the retina much like light is focused on the film in a camera. The retina translates that focused image into neural impulses
and sends them to the brain via the optic nerve. Occasionally, posterior vitreous detachment, injury or trauma to the eye or
head may cause a small tear in the retina. The tear allows vitreous fluid to seep through it under the retina, and peel it away
like a bubble in wallpaper.
Types
A substantial number of retinal detachments result from trauma, including blunt blows to the orbit, penetrating trauma, and
concussions to the head. A retrospective Indian study of 500 cases of rhegmatogenous detachments found that 11% were
due to trauma, and that gradual onset was the norm, with over 50% presenting more than one month after the inciting injury.
Prevalence
The risk of retinal detachment in otherwise normal eyes is around 5 in 100,000 per year. Detachment is more frequent in
the middle-aged or elderly population with rates of around 20 in 100,000 per year. The lifetime risk in normal eyes is about
1 in 300.
Although retinal detachment usually occurs in one eye, there is a 15% chance of developing it in the other eye, and this risk
increases to 25-30% in patients who have had cataracts extracted from both eyes.
Symptoms
A retinal detachment is commonly preceded by a posterior vitreous detachment which gives rise to these symptoms:
Although most posterior vitreous detachments do not progress to retinal detachments, those that do produce the followingsymptoms:
Treatment
There are several methods of treating a detached retina which all depend on finding and closing the holes (tears) which have formed in the retina.
After treatment, patients gradually regain their vision over a period of a few weeks, although the visual acuity may not be as
good as it was prior to the detachment, particularly if the macula was involved in the area of the detachment. However, if left
untreated, total blindness could occur in a matter of days.
Prevention
Retinal detachment can sometimes be prevented. The most effective means is by educating people to seek ophthalmic
medical attention if they suffer symptoms suggestive of a posterior vitreous detachment. Early examination allows
detection of retinal tears which can be treated with laser or cryotherapy. This reduces the risk of retinal detachment in those
who have tears from around 1:3 to 1:20.
There are some known risk factors for retinal detachment. There are also many activities which at one time or another have
been forbidden to those at risk of retinal detachment, with varying degrees of evidence supporting the restrictions.
Cataract surgery is a major cause, and can result in detachment even a long time after the operation. The risk is increased
if there are complications during cataract surgery, but remains even in apparently uncomplicated surgery. The increasing
rates of cataract surgery, and decreasing age at cataract surgery, inevitably lead to an increased incidence of retinal
detachment.
Trauma is a less frequent cause. Activities which can cause direct trauma to the eye (boxing, kickboxing, karate, etc.) may
cause a particular type of retinal tear called a retinal dialysis. This type of tear can be detected and treated before it
develops into a retinal detachment. For this reason governing bodies in some of these sports require regular ophthalmic
examination.
Individuals prone to retinal detachment due to a high level of myopia are encouraged to avoid activities where there is a risk
of shock to the head or eyes, although without direct trauma to the eye the evidence base for this may be unconvincing.
Some doctors recommend avoiding activities that increase pressure in the eye, including diving, skydiving, again with little
supporting evidence. According to one medical website, retinal detachment does not happen as a result of straining your
eyes, bending or, heavy lifting. Therefore, heavy weightlifting would appear to be fine. However, two scientific articles have
noted cases of retinal detachment or maculopathy due to weightlifting (specifically with the Valsalva method), and a third
documented an increase in blood pressure in the eye during weightlifting.
Activities that involve sudden acceleration or deceleration also increase eye pressure and are discouraged. These include
bungee jumping and drag racing, and may also include rollercoaster rides.
Definition
Retinal detachment is a disorder of the eye in which the retina peels away from its underlying layer of support tissue. Initial
detachment may be localized, but without rapid treatment the entire retina may detach, leading to vision loss and
blindness. It is a medical emergency.
The retina is a thin layer of light-sensitive tissue on the back wall of the eye. The optical system of the eye focuses light on
the retina much like light is focused on the film in a camera. The retina translates that focused image into neural impulses
and sends them to the brain via the optic nerve. Occasionally, posterior vitreous detachment, injury or trauma to the eye or
head may cause a small tear in the retina. The tear allows vitreous fluid to seep through it under the retina, and peel it away
like a bubble in wallpaper.
Types
 | Rhegmatogenous retinal detachment - A rhegmatogenous retinal detachment occurs due to a hole, tear, or break in | |
| the retina that allows fluid to pass from the vitreous space into the subretinal space between the sensory retina and the retinal pigment epithelium. | ||
| Exudative, serous, or secondary retinal detachment - An exudative retinal detachment occurs due to inflammation, | |
| injury or vascular abnormalities that results in fluid accumulating underneath the retina without the presence of a hole, tear, or break. | ||
| Tractional retinal detachment - A tractional retinal detachment occurs when fibrovascular tissue, caused by an injury, | |
| inflammation or neovascularization, pulls the sensory retina from the retinal pigment epithelium. |
A substantial number of retinal detachments result from trauma, including blunt blows to the orbit, penetrating trauma, and
concussions to the head. A retrospective Indian study of 500 cases of rhegmatogenous detachments found that 11% were
due to trauma, and that gradual onset was the norm, with over 50% presenting more than one month after the inciting injury.
Prevalence
The risk of retinal detachment in otherwise normal eyes is around 5 in 100,000 per year. Detachment is more frequent in
the middle-aged or elderly population with rates of around 20 in 100,000 per year. The lifetime risk in normal eyes is about
1 in 300.
| Retinal detachment is more common in those with severe myopia (above 5-6 diopters), as their eyes are longer and | |
| the retina is stretched thin. The lifetime risk increases to 1 in 20. Myopia is associated with 67% of retinal detachment cases. Patients suffering from a detachment related to myopia tend to be younger than non-myopic detachment patients. | ||
| Retinal detachment can occur more frequently after surgery for cataracts. The estimate of risk of retinal detachment | |
| after cataract surgery is 5 to 16 per 1000 cataract operations. The risk may be much higher in those who are highly myopic, with a frequency of 7% reported in one study. Young age at cataract removal further increased risk in this study. Long term risk of retinal detachment after extracapsular and phacoemulsification cataract surgery at 2, 5 and 10 years was estimated in one study to be 0.36%, 0.77% and 1.29%, respectively. | ||
| Tractional retinal detachments can also occur in patients with proliferative diabetic retinopathy or those with | |
| proliferative retinopathy of sickle cell disease. In proliferative retinopathy, abnormal blood vessels (neovascularization) grow within the retina and extend into the vitreous. In advanced disease, the vessels can pull the retina away from the back wall of the eye causing a traction retinal detachment. |
Although retinal detachment usually occurs in one eye, there is a 15% chance of developing it in the other eye, and this risk
increases to 25-30% in patients who have had cataracts extracted from both eyes.
Symptoms
A retinal detachment is commonly preceded by a posterior vitreous detachment which gives rise to these symptoms:
| flashes of light (photopsia) - very brief in the extreme peripheral (outside of center) part of vision | |
| a sudden dramatic increase in the number of floaters | |
| a ring of floaters or hairs just to the temporal side of the central vision | |
| a slight feeling of heaviness in the eye |
Although most posterior vitreous detachments do not progress to retinal detachments, those that do produce the following
| a dense shadow that starts in the peripheral vision and slowly progresses towards the central vision | |
| the impression that a veil or curtain was drawn over the field of vision | |
| straight lines (scale, edge of the wall, road, etc.) that suddenly appear curved (positive Amsler grid test) | |
| central visual loss |
Treatment
There are several methods of treating a detached retina which all depend on finding and closing the holes (tears) which
| Adatomed Silicone Oil |
- In this treatment, Adatomed Silicon Oil is a sterile, colorless liquid injected into the eye and mechanically holds the
retina in place until it reattaches. The oil is not intended to remain in the eye permanently, but is usually removed
within a year. This treatment has shown to be particularly effective in retinal detachment related to Cytomegalovirus
secondary to AIDS.
| Cryopexy and Laser Photocoagulation |
- Cryotherapy (freezing) and laser photocoagulation are treatments used to create a scar/adhesion around the retinal
hole to prevent fluid from entering the hole and accumulating behind the retina and exacerbating the retinal
detachment. Cryopexy and photocoagulation are generally interchangeable. However, cryopexy is generally used in
instances where there is a lot of fluid behind the hole; laser retinopexy will not take.
| Scleral buckle surgery |
- Scleral buckle surgery is an established treatment in which the eye surgeon sews one or more silicone bands (or
"tyres") to the outside of the eyeball. The bands push the wall of the eye inward against the retinal hole, closing the
hole and allowing the retina to re-attach. The bands do not usually have to be removed. The most common side
effect of a scleral operation is myopic shift. That is, the operated eye will be more short sighted after the operation.
| Pneumatic retinopexy |
- This operation is generally performed in the doctor's office under local anesthesia. It is another method of repairing
a retinal detachment in which a gas bubble is injected into the eye after which laser or freezing treatment is applied
to the retinal hole. The patient's head is then positioned so that the bubble rests against the retinal hole. Patients
may have to keep their heads tilted for several days to keep the gas bubble in contact with the retinal hole. The
surface tension of the air/water interface seals the hole in the retina, and allows the retinal pigment epithelium to
pump the subretinal space dry and pull the retina back into place. This strict positioning requirement makes the
treatment of the retinal holes and detachments that occurs in the lower part of the eyeball impractical. This
procedure is usually combined with cryopexy or laser photocoagulation.
| Vitrectomy |
- Vitrectomy is an increasingly used treatment for retinal detachment in countries with modern healthcare systems. It
involves the removal of the vitreous gel and is usually combined with filling the eye with a gas bubble. Advantages of
this operation is that there is no myopic shift after the operation. A disadvantage is that a vitrectomy always leads to
more rapid progression of a cataract in the operated eye. In many places vitrectomy is the most commonly
performed operation for the treatment of retinal detachment.
| Ignipuncture |
- Ignipuncture is an outdated procedure that involves cauterization of the retina with a very hot pointed instrument.[14]
It was pioneered and named by Jules Gonin in the early 1900s.
After treatment, patients gradually regain their vision over a period of a few weeks, although the visual acuity may not be as
good as it was prior to the detachment, particularly if the macula was involved in the area of the detachment. However, if left
untreated, total blindness could occur in a matter of days.
Prevention
Retinal detachment can sometimes be prevented. The most effective means is by educating people to seek ophthalmic
medical attention if they suffer symptoms suggestive of a posterior vitreous detachment. Early examination allows
detection of retinal tears which can be treated with laser or cryotherapy. This reduces the risk of retinal detachment in those
who have tears from around 1:3 to 1:20.
There are some known risk factors for retinal detachment. There are also many activities which at one time or another have
been forbidden to those at risk of retinal detachment, with varying degrees of evidence supporting the restrictions.
Cataract surgery is a major cause, and can result in detachment even a long time after the operation. The risk is increased
if there are complications during cataract surgery, but remains even in apparently uncomplicated surgery. The increasing
rates of cataract surgery, and decreasing age at cataract surgery, inevitably lead to an increased incidence of retinal
detachment.
Trauma is a less frequent cause. Activities which can cause direct trauma to the eye (boxing, kickboxing, karate, etc.) may
cause a particular type of retinal tear called a retinal dialysis. This type of tear can be detected and treated before it
develops into a retinal detachment. For this reason governing bodies in some of these sports require regular ophthalmic
examination.
Individuals prone to retinal detachment due to a high level of myopia are encouraged to avoid activities where there is a risk
of shock to the head or eyes, although without direct trauma to the eye the evidence base for this may be unconvincing.
Some doctors recommend avoiding activities that increase pressure in the eye, including diving, skydiving, again with little
supporting evidence. According to one medical website, retinal detachment does not happen as a result of straining your
eyes, bending or, heavy lifting. Therefore, heavy weightlifting would appear to be fine. However, two scientific articles have
noted cases of retinal detachment or maculopathy due to weightlifting (specifically with the Valsalva method), and a third
documented an increase in blood pressure in the eye during weightlifting.
Activities that involve sudden acceleration or deceleration also increase eye pressure and are discouraged. These include
bungee jumping and drag racing, and may also include rollercoaster rides.
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