Recurrent corneal erosion (abrasions)
(green when seen with fluorescein drops)
Recurrent corneal erosion is a painful eye condition, although your eye heals after a few hours or days. It is caused by a scratch on the surface of the eye in the previous months.
Although the first injury heals, the healing is not perfect and the 'scratch' returns over the next months for no apparent reason.
This page describes what is happening, and how you can reduce the number of recurrences.
the cornea, and its epithelium, shown in red enlarge
The cornea is the transparent 'window' of the eye at the front.
It is covered with a very thin skin, the epithelium.
the corneal injury..the abrasion enlarge
Typically the condition starts when the surface of the eye is scratched, possibly by a finger nail. A patch of epithelium is scratched off or wrinkles up, leaving a bare patch of cornea.
As the cornea has many nerves, this injury feels exquisitely painful, like a needle.
The abrasion always heals and the pain goes.
The healing takes 1mm a day from each side, so a large 7mm abrasion takes about 31/2 days, less in children, longer if you are older.
green when seen with fluorescein drops , but are sometimes difficult to see
When a doctor looks into your eye, even with the microscope slit lamp in the Eye Department, it may be very difficult to see the injury.
Sometimes it may not be apparent at the first examination. The doctor or nurse uses a yellow dye, called fluorescein, to examine your eye, and this dye sticks to a bare patch of cornea if there is one.
There may not actually be a bare patch ..the cornea may just be wrinkled and very loosely attached. Occasionally there is an underlying map-dot-finger-print dystrophy (genetically inherited sometimes), or epithelial microcysts.
there are tiny
pegs that hold each cell in place
blepharitis with blocked glands causes irregular tears and may help to cause recurrent abrasions
Normally the epithelium sticks down to the layer underneath (the basement membrane) firmly. Tiny pegs underneath the cells that make up the epithelium keep the cells stuck on to the basement membrane.
This is like painting on a wall: if you paint on the undercoat first, and then paint on the top coat, when the paint dries it will be well stuck down.
However, these pegs may take 6-12 months to reform properly after the original injury. During this time the epithelium may be prone to slipping and sliding, and this slipping and sliding causes this condition.
This is like painting on a bare surface with a 'top coat' of paint, when there is no 'undercoat'. The paint will dry but peel off really easily.
A few people will this condition have inherited genes that make this sticking process faulty, but this is quite unusual.
Certainly if your condition keeps happening year after a year a corneal specialist may detect this condition.
A second reason for the faulty sticking may lie in your tears.
The glands in your eyelid, especially your lower lid, make secretions that help tears to spread. If these glands get blocked, your tears do not spread properly, and the eyelid may stick to the epithelium and pull it off before the pegs have firmly fixed it in position.
If you clean your lids as below, the glands start to make their secretions again, and the process stops.
In addition to the regular cleaning of the eyelids, sometimes using a cream at night can stop the sticking (the 'sticking' of the eyelid to the epithelium occurs when you wake up in the morning).
the original abrasion, very painful indeed
All of a sudden, perhaps a month after the first injury, your eye starts
to feel exquisitely painful again.
It is as though the first injury recurs all by itself. Again this injury heals, and your eye starts to feel comfortable again.
If the patch of cornea with the recurrent abrasion
is small, as it usually is, your eye may heal after a few hours.
A larger patch will take days to heal.
Occasionally, you may not remember the original injury, and all of a sudden the condition develops.
RCE syndrome may be related to
- get collagen under bowmans and stops hemidesmosome function and get reduplication of bowmans
- Map dot finger print dystrophy
- Granular dystrophy
- Granular dystrophy even after graft ..delaminate if superficial, catch early
Typical treatment for corneal abrasion
- chloramphenicol ointment three times a day at night for 4 days
- cyclopentolate 1% twice daily for 2 days then
- cyclopentolate 1% at night for 1 week, then stop
- stop smoking as it delays healing (electronic cigarettes much, much safer)
- continue chloramphenicol ointment at night for 3 weeks as a lubricant
- chloramphenicol: for 4 days with minor abrasion, longer with a bigger one
- note cyclopentolate...
- havles the pain, but blurs sight (poor near vison); prevents the pupil sticking
- twice a day when eye painful, only at night when no ache
- pad eye/bandage contact lens if severe
- if using a a bandage a contact lens
- change lens every 2 weeks if possible
- use chlormaphenical minims if there is an abrasion present
- treat the abrasion as above
- stage 1
- stage 2
- doxycycline 100mg once a day (not if you are pregnant)
It takes a few weeks to work, and works for several weeks after it is stopped. One 3 month course is usually helpful, but occasionally longer treatment is needed.
- Also add prednisolone drops see
- doxycycline 100mg once a day (not if you are pregnant)
- stage 3
- alcohol delamination BJO 2007
- Healthy diet, as for blepharitis, standard healthy diet, may help a little
- portions of vegetables/day
- 2 portions fruit
- fish, especially oily fish, small portions twice week (eg salmon, tuna, sardine, mackerel, tuna, trout)
- very little saturated fat and transfats
- (saturated fat: dairy food, red meat (beef, lamb, pork))
- pulses such as soya beans, other beans, lentils, have plant sterols..these lower cholesterol
- no added salt, no sugar (cakes, chocolates, sweetened drinks)
- vitamin D..best achieved by walking 1-2 hours in daylight
- other treatments, review
- Use clean face cloth soaked in warm water, as hot as your eyelids can stand.
- Bathe your eye (closed) for 5-10 minutes. Rewarm the cloth if it gets cold. This makes the debris easier to remove, as below.
gently clean with a cotton bud, looking in mirror
- Clean the edge of your eyelids (the eyelash edge) with a wet cotton bud.
- Gently scrape off the debris moving the bud side to side.
- Looking in a mirror, pull your lower eyelid down with the index finger of one hand, and gently but firmly wipe the bud along the edge of the lid to scrape the debris off.
- With your chin up try the same on the upper, but this is harder.
Cleaning the eyelids
- First try warm sterile water, that is boiled water allowed to cool but still warm. (Warm tap water is usually quite safe.)
- Some people recommend a bicarbonate solution instead of plain water. Use a teaspoon of bicarbonate of soda, available from a chemist or supermarket bakery sections, to a pint of water. You can use this solution for a few days, keeping it in the fridge. Use a small amount each time.
- Using baby shampoo may help. Place a few drops in a pint of water to dilute it first.
- An antibiotic cream may help (as above); this can be squirted into the eye, or squirted onto your finger, and you can then spread it over the eyelids. Alternatively, apply the ointment with the cotton bud onto the eyelid.
- may be a healthy diet will help
- If the patch of epithelium is very loose, your doctor may scrape it off to allow fresh epithelium to grow in: this often helps. This is called debridement.
- There are more complex treatments available from corneal specialists, but these are not usually needed and not discussed here. They include micro-puncture of the loose patch, and laser.
- Some experts recommend contact lenses (see and here and here).
- There is one report botulinum toxin may help by closing the eyelid more completely at night, but this would not be necessary for most patients.
- there may be an underlying corneal dystrophy and here.
Typically you may notice recurrences even with these 'preventative' measures, but gradually the painful episodes become fewer with longer between. Also, instead of the pain lasting hours, your eye should start to heal more quickly, perhaps after half an hour.
Over a year you should start to feel a lot better, and have very little problem then.