Post on 03-Jun-2015
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Opthalmoscopy
Dr. Syed Mahbub Ali
HMO MU-I. SOMCH
What is Opthalmoscopy?
Ophthalmoscopy (funduscopy or fundoscopy) is a test that allows a health professional to see inside the fundus of the eye and other structures using an ophthalmoscope (or funduscope).
It is done as part of an eye examination and may be done as part of a routine physical examination. It is crucial in determining the health of the retina and the vitreous humor.
History of Ophthalmoscopy
• Ophthalmoscope was first invented by Hermann von Helmholtz(1821-1894), a professor of physics from Germany in 1851.
• He called it an Augenspiegel (eye mirror)
• In 1915, Josh Zele and Jon Palumbo invented the world's first hand-held direct illuminating ophthalmoscope
• Precursor to the device now used by clinicians around the world
• The company started as a result of this invention is Welch Allyn.
Commonly used brands in our country
• Keeler•Heine•Welch allyn
Types of Ophthalmoscope
Direct: This type of ophthalmoscope is most
commonly used during a routine physical examination.Indirect:
Indirect ophthalmoscopy provides a wider view of the inside of the eye and allows a better view of the fundus even if the lens is clouded by cataracts. Used by opthalmologist.
Parts of an ophthalmoscope
How to hold an ophthalmoscope?
Aperture settings
Wide angle view: Illuminates the largest area of fundus for the best possible general diagnosis through a large dilated pupil
Intermediate angle view: Permits easier access through an undilated pupil and in peripheral examination. Particularly useful in pediatric examination.
Macula view: Designed specifically for examination of the macula region of the fundus where a larger beam would create excessive pupillary reaction or patient discomfort.
Glaucoma: Projects a graticule onto the retina to assess the optic cup/disc ratio as an aid to glaucoma diagnosis.
Slit: Used primarily to determine retinal elevations and depressions, but may also be used to assess anterior chamber depth
Fixation Star or Cross: Projects a graticule onto the retina to assess the degree and direction of eccentric fixation, eg, as a result of macula degeneration
Beam filter
Red free: The red-free filter is used to examine the blood vessels in fine detail. By filtering out the red rays, blood vessels are silhouetted black against a dark green background.
Cobalt blue: Used in conjunction with fluorescein dye for the detection and examination of corneal scars and abrasions.
Safety: The unique Keeler safety filter cuts out the ultra violet, visible blue and infrared wavelengths said to cause phototoxic retinal damage with prolonged exposure.
Procedure of Opthalmoscopy
Pre-requisite:• It should be done in a dark room.• Explain whole of the procedure to the
patient.• Pupil is dilated or moderately dilated, but
be careful about mydriatic in Glaucoma or Intra ocular implanted lens (IOL). Dilating the pupil with 1% tropicamide or 1% cyclopentolate. This blurs the near vision for 2-3 hrs.
• Proper positioning: Lying or sitting in chair (better). If lying, move to opposite side when need to examine left eye.
• Appropriate direction.• Proper positioning of the examiner.• Both the eye should be seen
Examination sequence
• At first check your ophthalmoscope’s battery.
• Adjust the ophthalmoscope light to a comfortable brightness.
• Set the ophthalmoscope lens wheel to zero diopters (D) or correct your visual error by glass or ophthalmoscope lens.
• Adjust the focus ring & focus filter.
• Stand 1 hand or half meter apart from the patient in same horizontal plane as patient’s eye.
• Ask the patient to look straight ahead at a distant object – patient should continue to look in this direction even if the examiner’s head obscures the target.
• Patient’s right eye/ your right eye / your right hand /patient’s right side & vice versa.
A distance of about 10-30 cm from the patient try to see through the viewing hole of the ophthalmoscope and focus the light around the patient’s eye. Direction of light should be toward the nose, about 15 degrees from the line of fixation. Instruct the patient to see the distal fixation point with the opposite eye.
• The pupil should appear pink from 10 cm distance. This is the Red reflex.
• Any opacity in the media appear black upon the red reflex.
• If total red reflex is lost, it is due to Medial opacity ( cataract, vitreous haemorrhage) or Retinal problem. opacity
Pupillary red reflex
If patient doesn’t cooperate, fix the head by placing your other hand on the patient’s forehead & gently retract the upper eyelid.
Now come close to the patient’s head ,bring the ophthalmoscope to within 1-2cm of the eye . Not to touch the eye lash of the patient. Now you can see inside the eye. At first try to see any vessel, then follow it medially to find out the optic disc.
• Follow the blood vessels as they extend from the optic disc in four directions: superotemporally, inferotemporally, superonasally& inferonasally
• Ask the patient to look up to see superior retina, look down to see inferior retina, look temporally to examine temporal retina ,look nasally to examine the nasal retina
• Finally locate the centre of the macula by asking the patient to look directly at the light .Macula present two disc temporal from the optic disc
SOME COMMON MISTAKES that we can do, must be corrected by the following way:1.Examine at the same level2. Never obstruct the opposite eye 3.Never examine the right eye by left eye and left hand & vice versa4.Never give too much pressure to the head and shoulder
Common misinterpretations
1.Temporal pallor : Normally paler than nasal, often misinterpreted as abnormal
2.Myopic fundus: Myopic eye is large, so disc appears paler ,may be mistaken for optic atrophy.
3.Hypermetropic fundus: Small eye ,disc appears crowded, mistaken for papilledema
4.Drusen: Colloid bodies that may occcur on disc, mistaken for papilloedema
5.Pigmentation on the disc edge :Normal-may make disc seem pale
6.Tortuous vessels: normal
Purpose of Fundoscopy
• Detection of any haziness (opacity) in media,• Detection of any optical error.• To look inside of the eye.
Haziness in media
• Corneal opacity,• Lens opacity,• Vitreous opacity.
• It can be detected while observing the red reflex by moving the ophthalmoscope; Right/Left or up/down.
• If opacity moves opposite to the light:- Corneal opacity.
• If opacity moves towards the light :- Vitreous opacity.
• If opacity is fixed :- Lens opacity
Various opacities in media
Normal red reflex
Corneal opacity cataract
Optical Error
• If focus is hazy, adjust the lens of the ophthalmoscope to (-) or (+) and denote myopia or hypermetropia of the patient, but make sure that your eye is error free.
• If operator's eye power is normal or if he/she using glasses and Still the focus is hazy, it is due to optical error of the patient.
• At first you will have to turn the focus dial clockwise (plus or black lens), if error is corrected – Patient is Hypermetropic.
• If no improvement, then turn the focus dial anticlockwise (minus or red lens), if error is corrected – Patient is Myopic
What will see in fundus?
Retinal field
Disc
Macula
Blood Vessels
Vein
Artery
Optic Disc
• The optic disc or optic nerve head is the location where ganglion cell axons exit the eye to form the optic nerve
• The optic disc represents the beginning of the optic nerve
• There are no light sensitive rods or cones to respond to a light stimulus at this point. This causes a break in the visual field called "the blind spot" or the "physiological blind spot".
Things to be seen: 3c
• Contour(Margin):– The borders of the optic disc should be
clear and well defined
• Color:– Typically the optic disc looks like an orange-
pink area with a pale centre. The orange-pink appearance represents healthy, well perfused neuro-retinal tissue
Cup: As mentioned above the disc has an orange-pink rim with a pale centre. This pale centre is devoid of neuroretinal tissue and is called the cup
Blood vessels
Arteries:They are superficial, tortuous & brighter. Normally arterial walls are invisible, seen as streak, when light is focused bright streak light reflexion is seen.
• Veins : They are thick, deeper & darker. Normally venous pulsation is visible near the disc. • Total vessels count in disc : 7-10, which
include vein & artery. Count only the main vessels not the branches.
• Normal vein : artery = 3:2.
Common retinal abnormalities
White/yellow lesions:Cotton wool spots (soft exudates): White fluffy spots with indistinct margin caused by retinal ischemia due to accumulation of axonal proteins in the nerve fiber layer. Causes: Severe HTN, DM, retinal vein occlusion ,SLE,AIDS.
Cotton wool
Hard exudates: Bright yellowish sharp-edged lesions consist of lipid deposition that result from leakage of plasma from abnormal retinal capillaries. Causes: DM, HTN.
Chorioretinal atrophy: Well defined punched out lesion. Cause: Previous retinal inflammation, injury
Hard exudate
Hard exudate
Black lesion:Retinal pigment hypertrophy: Black lesion like bony spicules in periphery. Causes: Retinitis pigmentosa due to any cause, previous injury/laser.
Retinitis pigmentosa
Laser burns: black edged round lesion. Usually in regular pattern. Moles: flat, usually round. Normal findings. Melanoma: raised irregular malignant tumour.
Laser burns
Malignant melanoma
Red lesionDot haemorrhage: Thin vertical haemorrhage that may be difficult to differentiate from microaneurysms seen adjacent to blood vessels. Cause: DM.Blot haemorrhage: Larger full thickness haemorrhages in the deeper layer of retina .Rounded, localized. Causes: DM
Blot haemorrhage
Dot haemorrhage
Flame haemorrhage: Superficial bleed, shaped by nerve fibres into a fan with point towards the disc. Cause: HTN, retinal vein oclusion.
Deep large haemorrhage: Retinal/pre-retinal. Causes: Bleeding diathesis.
Subhyaloid haemorrhage: Irregular superficial with flat top. Causes: Subarachnoid haemorrhage.
Pathology in Optic Disc
Common abnormality in optic disc:• Optic disc swelling (Papilloedema/
Papillitis)• Optic atrophy.• Glaucomatous cupping.• Abnormal vessels.
Optic disc swelling
Optic nerve head swelling can be inflammatory or non-inflammatory . If non-inflammatory: Papilloedema If Inflammatory: Papillitis.
Papilledema
• Caused by raised intracranial pressure.
• Loss of venous pulsation (normally absent in 15% people.)
• Disc is abnormally red.• Margins are blurred, upper nasal
quadrant first, then lower nasal, then temporal margin.
• Physiological cup becomes obliterated.
• Retinal veins are slightly distended.• If papilloedema develops rapidly,
there will be marked engorgement of the retinal veins with haemorrhages & exudates on & arround the disc.
• If develops slowly, may be little or no vascular change.
PAPILLITIS
Ophthalmoscopy • Ophthalmoscopy may show no
abnormalities on retrobulbar optic neuritis.
• Dilatation of retinal arteries and veins on optic nerve disc .
• Possible petty splinter hemorrhages on the optic nerve disc .
• Retinal edema around the optic disc.
• Optic nerve disc has blurred margins
• Reddish (hyperemic) optic nerve disc due to dilatation of blood vessels .
• Possible white exudates on the optic nerve disc .
PAPILLITIS PAPILLOEDEMA
Usually unilateral Usually bilateral
Marked dimness of vision. May be slight dimness of vision. Not loss.
Loss of afferent pupillary reflex Not loss.
Visual field defect is usually central, particularly for red & green.
Peripheral constriction or enlargement of blind spot.
Eye ball is painful & tender. Not painful/tender.
Optic Atrophy
Features of optic atrophy• Disc is small.• Pale.• Loss of function.Added may be • Reduced number of
vessels (< 7).• Margin may be sharp /
blurred.
Types1. primary2. secondary
Primary optic atrophy
• Due to disease of the optic nerve.
• Disc is flat, pale/white.• Clear-cut, sharp margins.• Decreased / loss of vision
Secondary optic atrophy• Due to long standing
papilloedema.• Disc is greyish-white.• Indistinct margins.• Decreased / loss of
vision.
Optic atrophy
Papilloedema
In both picture disc margins are blurred/indistinct & vessels count decreased, but in secondary optic atrophy disc colour is pale & in papilloedema disc colour is abnormally red.
Optic cup and Cup Disc ratio(CDR)
• The optic cup is the white, cup-like area in the center of the optic disc.
• The ratio of the size of the optic cup to the optic disc (or cup-to-disc ratio) is the cup disc ratio.
• Normally the cup should take up less than 50% of the disc,i.e. CDR is <.5
• The CDR is measured to diagnose Glaucoma
Glaucoma
CDR= .4
CDR= .77
Progression of glucomatousOptic nerve Damage
Hypertensive retinopathy
Grade 1 : Arteriolar thickening, tortuosity, increased reflectiveness (‘Silver wiring’).
Grade 2: Grade 1 plus constriction of veins at arterial crossings (‘Arteriovenous nipping/nicking’).
Grade 3: Grade 2 plus evidence of retinal ischaemia (‘Flame shaped or blot hemorrhage and cotton wool exudate’).
Grade 4: Grade 3 plus papilloedema.
Grade 1
Grade 1
Grade 1
Silver wiring: – It’s the appearance of blood vessels in
which the arterial wall becomes so completely opaque that the blood column is not seen and the central light reflex occupies all of the width of the arteriole. –The light is completely reflected,
yielding a white ‘line,’ likened to a silver wire,
Grade 2
Normal AV nipping
Grade 2
• AV nicking: A vascular abnormality in the retina of the eye, visible on ophthalmologic examination, in which a vein is compressed by an arteriovenous crossing
• The vein appears "nicked" as a result of constriction or spasm
Grade 3
Cotton woolexudate Blot Haemorrhage
Flame shaped
Grade 4
Hypertensive Retinopathy
Diabetec Retinopathy
Classification of Diabetic Retinopathy–Non-proliferative ‘background’
retinopathy without maculopathy,–Maculopathy,–Pre-proliferative retinopathy,–Proliferative retinopathy
Non-proliferative ‘background retinopathy without maculopathy
Blot hemorrhage
Dot hemorrhage
Hard Exudate
Maculopathy
Hard exudate
Dot and blotHaemorrhage
Macular oedema Macular oedema, exudates, dot & blot hemorrhage
Pre proliferative retinopathyFeatures of pre-proliferative retinopathy: –Venous loops & beading, dot-blot
haemorrhage, large retinal hemorrhage, cotton wool exudates, macular oedema with reduced visual acuity, perimacular exudates, retinal hemorrhages of any size. But no proliferative changes.
Pre-proliferative retinopathy
Proliferative diabetec retinopathy
Abnormal blood vessels
HTN with DM
Fundoscopy findings in different conditions
Retinitis pigmentosa
1.Retinal pigmentation2.Thin Blood vessels3.Pale optic disc
Central retinal vein occlusion
1.Dilated and tortuous retinal veins2.Diffuse intraretinal haemorrhage in all 4 quadrants3.Cotton wool spots4.Swollen optic disk5. Retinal oedema
Central retinal artery occlusion
1. Retina appears pale due to Retinal edema2. Optic disc swelling3. Macula with cherry-red spot on white-yellow background
Acute Leukaemia
Acute leukemia:
Intra-retinal white-centered hge. (Roth spot)
Cotton-wool spots
Aplastic anaemia
Disc edema
Retinal hge
Vitreous haemorrhage
preretinal- unclotted blood with boatshaped configuration, moving towards gravity
Sub arachnoid Haemorrhage
Disc swelling
Retinal hge
Subhyaloid hge
Vitreous hge
Photocoagulation scar mark
Retinal detachment
Mobile Convex Corrugated
retina
Retinoblastoma
Leukocoria
Direct visualization of tumor
(Multi globulat--ed white mass withoverlying retinal detachment)
Roth’s spot
Bacterial endocarditisDM , LeukemiaPernicious anemiaHTN,AIDS
Cytoid body
Systemic lupus erythematosus.
IOL (intra ocular lens)
Anterior chamber IOL Posterior chamber IOL
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