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Transcript
Acute Ophthalmology F Dean Consultant Ophthalmologist Aims of the session • Anatomy of the eye and orbit • Ophthalmic history, examination and assessment • Ophthalmic triage • Conditions –true emergencies • Using an ophthalmoscope Anatomy of the eye Frontal View Of Orbital Muscles Anatomy of the Visual Pathway Taking the history What symptoms may be specific to the eye? • Red/sore/watering/itchy/burning/hot • Aching • Can’t see – Intermittent – Complete or partial • Double vision • Funny vision- flashes/floaters/distortion Ophthalmic History Loss of Vision • rate of loss • near or distance • total blurr or part blurr – general loss = loss of acuity – part loss = loss of visual field • associated features e.g distortion, floaters, flashing lights, pain etc Ophthalmic Symptoms from different structures • Eyelid-itchy, burning,dry • Conjunctiva- watery,sticky, burn, sore • Eye ball- aching, visual disturbance, floaters • Orbit- watery, ache • Brain- headache, visual disturbance, photopsia, diplopia Pain Pain • Type of pain – Gritty sandy feeling = ocular surface – Ache within the eye = deeper tissue involvement e.g. uveal tissues • duration • precipitating or relieving factors • Location/radiation History • • • • Past medical history Social history Drug history Family history General History • Diseases with known ocular associations – Diabetes, atherosclerosis, collagen vascular disease, – Hypertension – Meningitis – Raised intracranial pressure Eye Examination • Visual acuity. • Examination of the – Lids – Cornea and conjunctiva – Pupils – Red reflex/lens – Fundus • Examination of the eye movements • Examination of the fields Visual Acuity • Logmar acuity Newspaper for near vision • With spectacle correction as required • With and without a pinhole Acuity Chart testing • 6/6 = line 7 – Person can see at 6 m what a normal person can see at 6 m • 6/60 = top line – Person can see at 6 m what a normal person can see at 60 m 6/60 6/36 6/24 6/18 6/12 6/9 6/6 Using an occluder with a pinhole Ophthalmic examination • Visual acuity. – With and without glasses • Examination of the – – – – – Lids Cornea and conjunctiva Pupils Red reflex/lens Fundus • eye movements • Visual fields Topical Medication for Examination • To check for break in epithelium – Fluorescein • Local anaesthetic – Benoxinate 0.4% • For pupil dilation – Tropicamide 0.5% – Phenylephrine 2.5% External Eye • Use good general illumination e.g angle poised lamp • Pen torch pencil beam for tangent illumination + fluorescein stain • Use topical anaesthetic when required for patient comfort • Start with eyelids, then conjunctiva, cornea and pupil Pupils • Direct and consensual reflex • Afferent defect – problem with message reaching the brain • Efferent defect – problem responding to light stimulus Assessment of the extraocular movements Visual Fields Assessment of Squint • Monocular vision – may have amblyopia (lazy eye) • Eye movements – is there any restriction of movement – is there any double vision • Cover Test – check for ocular deviation Extra ocular movements • Visual axes are not in parallel Ophthalmoscopy • Don’t be afraid to DILATE the pupil • Correct for refractive errors • Use the optic disc as a landmark and follow the arcades Ophthalmoscopy To see with an ophthalmoscope you have to be very close to the patient What is Triage? A process by which a patient is assessed upon arrival to determine the urgency of the problem and to designate the appropriate healthcare resources to care for the identified problem Aim of Triage System • Realistic priorities of care are determined which result in appropriate, efficient and effective service delivery Discriminators • General • Specific General Discriminators • • • • • • Life Threat Pain Haemorrhage Conscious level Temperature Acuteness General Discriminator • Ophthalmic patients with pain in conjunction with specific discriminators. Specific Discriminators • • • • • • Chemical eye injury Penetrating eye trauma Sudden loss of vision Reduced visual acuity Inappropriate history Red eye with abnormal pupil reaction Specific discriminators • Chemical eye injury – Acid – Alkali – molten metal – CS gas Specific discriminators • Penetrating eye trauma – Traumatic event causing perforation of the globe – May contain foreign body Specific discriminators • Sudden complete loss of vision – loss of vision in one or both eyes within the preceding 24 hours – Normally vascular Specific discriminators • Reduced Visual acuity – corrected visual acuity loss. Specific discriminators • Inappropriate history – alleged mechanism of injury does not fit the injury Specific discriminators • Red eye – with or without pain – complete or partially red Discriminators • • • • In addition to specific discriminators add Pupil reaction Shape Size Specific discriminators • Pupil reaction – fixed dilated pupil – distorted pupil – festooned pupil Red Flags • Ocular pain- particularly deep ache • Visual loss • Bleeding • Always refer when pain and visual loss are present simultaneously. MANCHESTER TRIAGE DISCRIMINATORS (OPHTHALMIC) Categories • • • • • Red Orange Yellow Green Blue RED CATEGORY – – – – – Alkali most commonly Lime Sodium hydroxide Cleaning solutions Bleach Chemical Injury • Alakali injury • Other chemical injury. RED CATEGORY – Acid eg battery – molten metal – CS gas ORANGE CATEGORY • Urgent -see within 5 minutes a delay in treatment could be sight threatening Intra-orbital foreign body ORANGE CATEGORY • Perforating injurieswith a suspicion of intraocular foreign bodies Air bag injury ORANGE CATEGORY • Acute Glaucoma • Non- accidental causes loss of vision within hours • Post operative patients before the fifth day ORANGE CATEGORY • Acute orbital cellulitis • Accidents causing gross visual disturbance • Obvious bleeding/ lacerations/ Hyphaema ORANGE CATEGORY • Corneal ulcers with hypopion • Endophthalmitis • Sudden onset diplopia Penetrating Injury Corneal laceration Perforating injury Shot Gun Injury Blunt Injury, Contusion • Bruising to eye lids Blunt Injury Blunt injury • • • • Irido dialysis Pain Risk of Pressure Likely other injury – Eg.retinal trauma • Distortion of globe • Tearing of internal structures Blunt Injury • Hyphaema- blood in anterior chamber • Microscopic or Macroscopic – Blood in the anterior chamber – Pressure problems, esp. re-bleed • Must ask if FH of sickle cell in relevant ethnic gp – Other injury – Children require admission – Must ask if FH of sickle cell in relevant ethnic group Blow-out Fracture • Usually caused by impact from object larger than bony margins of the orbit • high pressure in orbit causes fracture of floor • Inferior orbital contents prolapsed into the maxillary sinus Blow-out fracture-symptoms • • • • • Black Eye Double Vision Blurred Vision Small eye (enopthalmos) Pulling sensation on up gaze Blow-out Fracture- signs • Chemosis and echimosis around eye • Limitation of up and down gaze. • Loss of sensation below lower lid • Order X-ray Facial Bone Fractures • In a facial injury involving a fracture there is a 30% chance of maxillary involvement • Chance of ocular injury – 10-23% in Le Fort II and III – 2-10% blinded – 89% frontal sinus and supra orbital Le Fort 3 All red and orange conditions need referral to an ophthalmologist • All conditions classified as Blue/green can wait What Ophthalmic conditions require fundoscopy? • Anything with Visual loss • What systemic conditions require ophthalmoscopy? Systemic diseases requiring ophthalmoscopy • • • • • Head injury? Suspicious of raised ICP Meningitis Neurological- MS Vascular presentations- CVA, Hypertension What does the fundus tell you? • • • • • Papilloedema- raised ICP Pale disc- previous optic neuritis Haemorrhagic disc Hypertensive changes Diabetic retinopathy- control/ renal function