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Method of illumination:Direct oCharacter of aperture:Wide open oTypical magnification:5-45x oAngle of illumination:~60o-90ooFilter:Neutral density VAN HERRICK TECHNIQUEFor examination of depth of anterior chamber (useful for diagnosis of glaucomatous processes) Qualitative Evaluation of Angle of Anterior ChamberTECHNIQUEoMethod of illumination:DirectoCharacter of aperture:Narrow beam (close to limbus)oTypical magnification:MediumoAngle of illumination:~60ooFilter:Neutral density‐In slit lamp, view ant to post -Examine 3 regions (L, mid, R) -Point of reference:thickness of slit light -Thickness on L and R side should be the thickness of the anterior chamber (if same =1x) -Middle (dapat malalim, this is the Corneal thickness = 3-4x) FUNDOSCOPY WITH SLIT LAMP3‐MIRROR GONIOSCOPIC LENSoTECHNIQUECharacter of aperture:Moderate slit beamTypical magnification:16-45xAngle of illumination:Coaxial (~10o)Filter:Neutral density4 mirrors: 1st: used to view angle; 2nd: view surface of iris; 3rd: viewposterior of iris; 4th: central mirror, view the retinaCONTACT SLIT LAMP FUNDOSCOPY LENSE SLIT LAMP
________________________________________________OPHTHALMOLOGY_________________________________________________________________________________________________________________________________________________________________Transcribers:PAGGAO | YALA Page 9of 9oTECHNIQUECharacter of aperture:2mmTypical magnification:16-45xAngle of illumination:Coaxial (5-10o)Filter:Neutral densityNON‐CONTACT SLIT LAMP FUNDOSCOPY LENSESoTECHNIQUECharacter of aperture:Moderate (2mm)Typical magnification:16-45xAngle of illumination:Coaxial (~10o)Filter:Neutral density
________________________________________________OPHTHALMOLOGY_________________________________________________________________________________________________________________________________________________________________Transcribers:BUGAYONG | GELOSO Page 1of 31.02C OBJECTIVE & SUBJECTIVE EXAMINATION OF THE EYE‐VISUAL ACUITYDR. MONDIGUING‐August 18, 2017PRELIMS: QUIZ 1Bold,red letters = Emphasized during lectureItalic, blue letters = AudioGreen= OT VISUAL ACUITYfirst examination done in eye assessment most frequently done recorded as “VA” is a FRACTION: Test dstance Distance at which the smallest optotype identified subtends an angle of 5 minutes of an arc OPTOTYPESOptoptype refers to letters, numbers or images that are seen in a visual acuity chart Size of letters are all measure and scaled so when you measured them they are all 5 minutes of an arc Minute refers to measurement of an angle, smaller than a degree 1 minute = .0166 degree (you don’t need to memorize these)Basis for Constructing the Optotype-optotype that is at 20/200 means at 200 ft this is the size of a letter that subtends an angle of 5 degrees of an arc. -The letter only becomes bigger as the distance becomesfarther. So if the patient is at 50 ft, the letter should be thatbig (refer to image) and at 100ft, it should be that big. Thesize of the optotype changes depending on the distance ofthe observer.VISUAL ACUITY: MEASUREMENTNormal visual acuity is 20/20 SNELLEN’S CHART – most commonly used, level of difficulty is different per row BAILEY – LOVIE CHART - level of difficulty is equal per row Measured in 2 ways: oDistance VisionoNear VisionWe usually do distance vision first then near vision DISTANCE VISIONMeasured at a certain distance: 20ft or 6m with ample