macular disease
TRANSCRIPT
MACULAR DISEASE
Dr Russell J Watkins
Macular Disease ARMD SRNVM Angioid streaks Central serous
chorioretinopathy Cystoid macular oedema Macular holes
Epiretinal membranes Choroidal folds Myopic maculopathy Traumatic maculopathy Hereditary macular
dystrophies
Macular Disease Symptoms
VA↓ (especially NV) Central scotoma ↑Hypermetropia Metamorphopsia Micropsia Macropsia Red-green colour defects
Macular Disease Assessment
DVA & NVA Colour vision Photostress recovery test Amsler chart Maddox rod Visual fields Fundus evaluation - slit lamp BIO Other electrophysiological & psychophysical
tests Ophthalmologist will perform FFA
ARMD Leading cause of blindness in western world ~30% of all blind registrations in the UK Bilateral though asymmetrical Features
Drusen RPE tears
Dry ARMD Exudative ARMD
Drusen White-yellow lesions at posterior pole Occur frequently in over-60s Hyaline material deposited in Bruch’s membrane Probably due to ↓RPE phagocytosis 2 morphologies
Large & fluffy (soft) Small & discrete (hard)
Drusen Pathology
Atrophy of RPE & photoreceptor outer segments Thickening & hydrophobicity of Bruch’s membrane Macrophage invasion of drusen; vascularisation
Significance May reflect kidney disease in under-50s In ARMD, with hyperpigmented large confluent soft
drusen, high risk of progression to SRNVM (9% pa)
RPE Tears RPE tears associated with occult SRNVM RPE tears can → acute severe visual loss - some
may retain good VA in spite of subfoveal defect Round, asymmetrical elevations of RPE
associated with RPE tears ±intraretinal haemorrhage, exudate, serous elevation of the retina
High risk of second eye visual loss (37% in first year) as a result of RPE tear or SRNVM
Dry ARMD Choroidal sclerosis Large areas of well-circumscribed RPE atrophy,
neurosensory retinal atrophy & choriocapillaris atrophy
Prominence of choroidal vessels
Exudative ARMD RPE detachment (PED)
Serous, demarcated yellow-orange, dome-shaped elevation of RPE
Confluent drusen can produce RPE elevation Some have occult SRNVM
• Notching of PED• Uneven elevation of PED• Radial chorioretinal folds surrounding PED• Intraretinal exudate• Intraretinal & subretinal blood• Serous retinal elevation
Exudative ARMD SRNVM
Metamorphopsia ±acute visual loss Round oval green-grey lesion PED - serous, haemorrhagic or solid (drusen) Serous retinal elevation Intra- & subretinal haemorrhage, occasional
intravitreal Intraretinal exudate Later disciform scarring
Disciform Degeneration Haemorrhage from SRNVM → circumscribed
scarring at macula SRNVM proliferate due to abnormalities of
Choriocapillaris Bruch’s membrane RPE Outer retinal layers
SRNVM - it’s not just ARMD Congenital or hereditary
Rubella retinopathy Best’s disease Cone dystrophy Retinitis pigmentosa
Vascular Coat’s disease Central or branch retinal vein occlusion
SRNVM Inflammatory
POHS Birdshot chorioretinopathy AMPPE Serpiginous choroidopathy VKH Chronic uveitis Toxoplasmosis Toxocariasis
SRNVM Traumatic
Choroidal rupture Photocoagulation RD surgery
Neoplastic Choroidal naevus Choroidal melanoma Choroidal haemagioma Choroidal metastases
SRNVM Degenerative
ARMD Myopia (Fuch’s spot) Angioid streaks Serpiginous choroidopathy Optic nerve drusen
Management of ARMD Optometrist’s role
Optimal correction and LVAs BD8 SRNVM may be amenable to macular laser
photocoagulation Extrafoveal membrane if >200µm from fovea Subfoveal membrane, after FFA assessment,
well-defined borders <3.5 disc areas in size Treatment benefits only apparent some years
after treatment
Management of ARMD New treatments
Thalidomide - now proven to be of no benefit Radiotherapy - ditto Visudyne (verteporfin) - exudative ARMD only
• IV injection of verteporfin (selectively accumulates in the new vessels)
• Activation by non-thermal laser stimulation (→ free radicals) results in cessation of growth of new vessels
• Known as “Photodynamic Therapy”• With Rx, 33% lose vision; without Rx, 66% lose
vision
Angioid Streaks Defects in collagen & elastin of Bruch’s
membrane → 2° changes in RPE & choriocapillaris Dark, irregular lines radiating from ONH which
end abruptly posterior to the equator May interlink around ONH May cause SRNVM which may bleed Usually bilateral 50% related to systemic disorders of
connective tissue
Angioid Streaks Associations
Pseudoxanthoma elasticum Ehlers-Danlos syndrome Marfan’s syndrome Paget’s disease Sickle cell anaemia & thalassaemia Lead poisoning Acromegaly
Central Serous Chorioretinopathy
Unilateral; M>F (?pregnancy); 20-45yrs Often “obsessive personality” Myopia>hypermetropia Pathogenesis
Breakdown of BRB Fluid accumulates in subretinal space Sometimes associated with RPE detachment
Symptoms Blurred central vision Metamorphopsia & micropsia
Central Serous Chorioretinopathy
Signs VA 6/6-6/36; often improves with a +1D lens Positive central or paracentral scotoma Red desaturation Small serous sensory RD of macula Sometimes associated with an optic pit
FFA Characteristic “smokestack” or “inkblot”
appearance in late venous phase
Central Serous Chorioretinopathy
Prognosis 90% spontaneously resolve 40% recur
Treatment Usually conservative Occasionally photocoagulation indicated
• Residual visual defecit after recurrence• Duration >6m• Only eye
Cystoid Macular Oedema Henle’s layer is unsupported around macula
allowing extracellular fluid to accumulate Source of leak is macular capillaries Forms “flower-petal” arrangement as a result of
radiation of cone fibres May develop intraretinal cysts
Causes of CMO Retina
Diabetic & hypertensive retinopathy CRVO/BRVO Macroaneurysms & telangiectasia Tumours Retinitis pigmentosa Retinitis & vasculitis Irvine-Gass syndrome
Causes of CMO Vitreous
Preretinal membrane formation Vitritis
Choroid Tumours esp. haemangioma Subretinal neovascularisation Longstanding uveitis
Macular Hole Features
Full thickness retinal hole Cuff of surrounding subretinal fluid Deposits at base
Causes Idiopathic (focal contraction of posterior
hyaloid face) Myopia Trauma
May respond to vitrectomy & gas tamponade
Epiretinal Membranes Contraction produces macular traction Early (cellophaning)
Often no visual symptoms Translucent sheen Retinal striae Slight retinal traction
Late (macular pucker) Metamorphopsia Opaque membrane visible Macular oedema
Epiretinal Membranes Causes
Idiopathic RD surgery Photocoagulation (esp. excessive PRP) Cryotherapy CRVO/BRVO Diabetic retinopathy Trauma Longstanding chorioretinitis
May be amenable to membrane peeling but full visual recovery unlikely
Choroidal Folds Causes
Hypermetropia
Ocular disease• Scleral buckling, scleritis, choroidal masses,
ocular hypotony, ocular trauma, papilloedema
Orbital disease• TED, tumours, cellulitis
Myopic Degeneration In very large eyes, retina & choriocapillaris are
thinned Myopic macular degeneration results Risk of complications correlated with axial length
Myopic Degeneration Early findings
PPA, thinned macular RPE, tilting of the optic disc
Late findings Lacquer cracks (breaks in Bruch’s membrane),
posterior staphyloma, macular haemorrhages, SRNVM & macular atrophy
Forrester-Fuch’s spots are localised RPE proliferations
Peripheral & macular holes predispose to RD
Traumatic Maculopathy Commotio retinae
Contre-coup injury Berlin’s oedema if lesion close to macula Opacification of the retina - NOT oedema (in spite of
name) - rather it is disruption of the photoreceptors Good prognosis if RPE intact
Choroidal rupture Occurs if sufficient force to expand eye Choriocapillaris, Bruch’s membrane & RPE split Defect usually concentric with optic disc & accompanied
by subretinal haemorrhage
Traumatic Maculopathy Purtscher’s retinopathy
Seen after crush injuries esp. to chest Caused by activation of coagulation cascade Cotton wool spots & superficial retinal
haemorrhages are evident Guarded prognosis (OA associated)
Solar retinopathy Phototoxicity NOT thermal injury (free radical
release) Photoreceptor membrane is damaged
Hereditary Macular Dystrophies Stargardt’s disease Fundus albipunctatus Best’s vitelliform dystrophy Pattern dystrophies Cone dystrophy