Here is a revised version of the guidance on the management of bacterial conjunctivitis:

– It is important to inform the patient that most cases of bacterial conjunctivitis will resolve on their own within 5-7 days without any treatment.
– However, if the condition is severe or if there is a need for rapid resolution, topical antibiotics may be prescribed. In some cases, a delayed treatment strategy may be appropriate, and the patient should be advised to start using topical antibiotics if their symptoms have not improved within 3 days.
– There are several options for topical antibiotics, including Chloramphenicol 0.5% drops (to be applied every 2 hours for 2 days, then 4 times daily for 5 days) and Chloramphenicol 1% ointment (to be applied four times daily for 2 days, then twice daily for 5 days). Fusidic acid 1% eye drops can also be used as a second-line treatment, to be applied twice daily for 7 days.
– It is important to note that there is no recommended exclusion period from school, nursery, or childminders for isolated cases of bacterial conjunctivitis. However, some institutions may have their own exclusion policies.
– Provide the patient with written information and explain the red flags that indicate the need for an urgent review.
– Arrange a follow-up appointment to confirm the diagnosis and ensure that the symptoms have resolved.
– If the patient returns with ongoing symptoms, it may be necessary to send swabs for viral PCR (to test for adenovirus and Herpes simplex) and bacterial culture. Empirical topical antibiotics may also be prescribed if they have not been previously given.
– Consider referring the patient to ophthalmology if the symptoms persist for more than 7 to 10 days after initiating treatment.

For more information, you can refer to the NICE Clinical Knowledge Summary on Infective Conjunctivitis.

The optic chiasm is situated just below the hypothalamus and is in close proximity to the pituitary gland. When the pituitary gland enlarges, it can impact the functioning of the optic nerve at this location. Specifically, the fibres from the nasal half of the retina cross over at the optic chiasm to form the optic tracts. Compression at the optic chiasm primarily affects these fibres, resulting in a visual defect that affects peripheral vision in both eyes, known as bitemporal hemianopia. There are several causes of optic chiasm lesions, with the most common being a pituitary tumor. Other causes include craniopharyngioma, meningioma, optic glioma, and internal carotid artery aneurysm. The diagram below provides a summary of the different visual field defects that can occur at various points in the visual pathway.

Central retinal artery occlusion (CRAO) is characterized by sudden, painless, and unilateral loss of vision. The appearance of the retina in CRAO is distinct from that of CRVO. It shows a pale retina with narrowed blood vessels. A notable feature is the presence of a ‘cherry-red spot’ at the center of the macula, which is supplied by the underlying choroid. Additionally, examination often reveals an afferent pupillary defect.

On the other hand, branch retinal artery occlusion (BRAO) typically affects only one quadrant of the retina, leading to visual field deficits in that specific area rather than complete loss of vision.

This patient has presented with a history consistent with retinal detachment preceded by posterior vitreous detachment.

Posterior vitreous detachment occurs when the vitreous membrane separates from the retina. There are several risk factors for posterior vitreous detachment, including myopia, recent cataract surgery, diabetes mellitus, increasing age, and eye trauma.

The main clinical features of posterior vitreous detachment include flashes of light (photopsia), increased numbers of floaters, a ring of floaters to the temporal side of central vision, and a feeling of heaviness in the eye. Another characteristic is Weiss’ ring, which is an irregular ring of translucent floating material in the vitreous.

It is important to note that there is a small associated risk of retinal detachment in the 6-12 weeks following a posterior vitreous detachment. Retinal detachment can be distinguished from posterior vitreous detachment by the presence of a dense shadow in the periphery that spreads centrally, a curtain drawing across the eye, straight lines suddenly appearing curved (positive Amsler grid test), and central visual loss with decreased visual acuity.

Given the patient’s presentation, an urgent referral to ophthalmology is necessary. In most cases of retinal detachment, surgical repair will be required.

Scleritis is a serious condition characterized by inflammation of the sclera, the white outer layer of the eye. It often affects both eyes, with bilateral involvement seen in about half of the cases. While the cause of scleritis can be unknown (idiopathic), it is associated with systemic inflammatory diseases like rheumatoid arthritis in approximately one-third of patients. In fact, scleritis can sometimes be the initial manifestation of these inflammatory conditions.

The clinical features of scleritis include moderate to severe pain, which can be felt in the brow or jaw. The pain worsens with eye movement and may disrupt sleep. The onset of symptoms is typically gradual. Other common symptoms include sensitivity to light (photophobia), excessive tearing (epiphora), and redness of both the superficial and deep episcleral vessels. The affected eye may also be tender to touch, and there may be a decrease in visual acuity. Some individuals may have a history of previous episodes of scleritis.

In summary, scleritis is a serious inflammatory disease of the sclera that can be associated with systemic inflammatory conditions. It presents with significant pain, often referred to the brow or jaw, and worsened by eye movement. Other symptoms include photophobia, excessive tearing, and redness of the episcleral vessels. It is important to recognize scleritis as it can be the first sign of underlying inflammatory diseases.

This patient is experiencing a condition called right-sided abducens nerve palsy, which means that their sixth cranial nerve is paralyzed. As a result, the lateral rectus muscle, which is responsible for moving the eye outward, is also paralyzed. This means that the patient’s right eye is unable to turn outward. This can lead to a condition called convergent strabismus, where the eyes are not aligned properly, and diplopia, which is double vision. To compensate for the double vision, patients often tilt their head towards the side of the paralyzed muscle.

The optic chiasm is situated just below the hypothalamus and is in close proximity to the pituitary gland. When the pituitary gland enlarges, it can impact the functioning of the optic nerve at this location. Specifically, the fibres from the nasal half of the retina cross over at the optic chiasm to form the optic tracts. Compression at the optic chiasm primarily affects these fibres, resulting in a visual defect that affects peripheral vision in both eyes, known as bitemporal hemianopia. There are several causes of optic chiasm lesions, with the most common being a pituitary tumor. Other causes include craniopharyngioma, meningioma, optic glioma, and internal carotid artery aneurysm. The diagram below provides a summary of the different visual field defects that can occur at various points in the visual pathway.

This patient has presented with acute closed-angle glaucoma, which is a serious eye condition requiring immediate medical attention. It occurs when the iris pushes forward and blocks the fluid access to the trabecular meshwork, leading to increased pressure within the eye and damage to the optic nerve.

The main symptoms of acute closed-angle glaucoma include severe eye pain, decreased vision, redness around the cornea, swelling of the cornea, a fixed semi-dilated pupil, nausea, vomiting, and episodes of blurred vision or seeing haloes.

To confirm the diagnosis, tonometry is performed to measure the intraocular pressure. Normal pressure ranges from 10 to 21 mmHg, but in acute closed-angle glaucoma, it is often higher than 30 mmHg. Goldmann’s applanation tonometer is commonly used in hospitals for this purpose.

Management of acute closed-angle glaucoma involves providing pain relief, such as morphine, and antiemetics if the patient is experiencing vomiting. Intravenous acetazolamide is administered to reduce intraocular pressure. Additionally, a topical miotic medication like pilocarpine is started about an hour after initiating other treatments to help constrict the pupil, as it may initially be paralyzed and unresponsive.

Overall, acute closed-angle glaucoma is a medical emergency that requires prompt intervention to alleviate symptoms and prevent further damage to the eye.

Cement contains lime, which is a powerful alkali, and this can cause a serious eye emergency that requires immediate treatment. Alkaline chemicals, such as oven cleaner, ammonia, household bleach, drain cleaner, oven cleaner, and plaster, can also cause damage to the eyes. They lead to colliquative necrosis, which is a type of tissue death that results in liquefaction. On the other hand, acids cause damage through coagulative necrosis. Common acids that can harm the eyes include toilet cleaners, certain household cleaning products, and battery fluid.

The initial management of a patient with cement or alkali exposure to the eyes should be as follows:

1. Irrigate the eye with a large amount of normal saline for 20-30 minutes.
2. Administer local anaesthetic drops every 5 minutes to help keep the eye open and alleviate pain.
3. Monitor the pH every 5 minutes until a neutral pH (7.0-7.5) is achieved. Briefly pause irrigation to test the fluid from the forniceal space using litmus paper.

After the initial management, a thorough examination should be conducted, which includes the following steps:

1. Examine the eye directly and with a slit lamp.
2. Remove any remaining cement debris from the surface of the eye.
3. Evert the eyelids to check for hidden cement debris.
4. Administer fluorescein drops and check for corneal abrasion.
5. Assess visual acuity, which may be reduced.
6. Perform fundoscopy to check for retinal necrosis if the alkali has penetrated the sclera.
7. Measure intraocular pressure through tonometry to detect secondary glaucoma.

Once the eye’s pH has returned to normal, irrigation can be stopped, and the patient should be promptly referred to an ophthalmology specialist for further evaluation.

Potential long-term complications of cement or alkali exposure to the eyes include closed-angle glaucoma, cataract formation, entropion, keratitis sicca, and permanent vision loss.

Conjunctivitis is the most common reason for red eyes, accounting for about 35% of all eye problems seen in general practice. It occurs when the conjunctiva, the thin layer covering the white part of the eye, becomes inflamed. Conjunctivitis can be caused by an infection or an allergic reaction.

Infective conjunctivitis is inflammation of the conjunctiva caused by a viral, bacterial, or parasitic infection. The most common type of infective conjunctivitis is viral, with adenoviruses being the main culprits. Bacterial conjunctivitis is also common and is usually caused by Streptococcus pneumoniae, Staphylococcus aureus, or Haemophilus influenzae.

The symptoms of infective conjunctivitis include sudden redness of the conjunctiva, discomfort described as a gritty or burning sensation, watering of the eyes, and discharge that may temporarily blurry vision. It can be challenging to differentiate between viral and bacterial conjunctivitis based on symptoms alone.

Here are some key features that can help distinguish between viral and bacterial conjunctivitis:

Features suggestive of viral conjunctivitis:
– Mild to moderate redness of the conjunctiva
– Presence of follicles on the inner surface of the eyelids
– Swelling of the eyelids
– Small, pinpoint bleeding under the conjunctiva
– Pseudomembranes (thin layers of tissue) may form on the inner surface of the eyelids in severe cases, often caused by adenovirus
– Less discharge (usually watery) compared to bacterial conjunctivitis
– Mild to moderate itching
– Symptoms of upper respiratory tract infection and swollen lymph nodes in front of the ears

Features suggestive of bacterial conjunctivitis:
– Purulent or mucopurulent discharge with crusting of the eyelids, which may cause them to stick together upon waking
– Mild or no itching
– Swollen lymph nodes in front of the ears, which are often present in severe bacterial conjunctivitis
– If the discharge is copious and mucopurulent, infection with Neisseria gonorrhoeae should be considered.

By considering these distinguishing features, healthcare professionals can better diagnose and manage cases of conjunctivitis.