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26 Cards in this Set
- Front
- Back
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The principal planes of Gullstrand's exact eye lie
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within the aqueous
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Which of the following changes will produce a DECREASE in the total optical power of the eye
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increase the refractive index of the cornea
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all of the following occur when the lens undergoes accommodation EXCEPT which one?
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the posterior lens surface pushes backwards into the vitreous towards the retina
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the 1st Purkinje img produced in an unaccommadted eye viewing a distant object is
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a virtual, erect img located near the anterior surface of the lens
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Which of the Purkinje images changes the most when the eye accommodates from distance to near?
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purkinje img 3
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Which of the PS images is a catoptric img?
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purkinje image 1
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which axes are used in the definition of the angle lambda
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pupillary axis & line if sight
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by how much must the eyes converge to change fixation from a target at infinity to one at 1m? Assume a pupillary dist (PD) of 70mm
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7pd
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which of the following is not part of the principles of keratometry
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a central corneal measurement zone of 6-8mm in diameter
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which of the following stmts concerning the corneal topography maps shown above is correct
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Pattern A --> it is the pattern seen in 1.00 or more diopters of astigmatism & is called bowtie
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the entrance pupil of the human eye is a
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virtual, erect, magnified img of the pupil
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which of the following is 1 of the differences b/w the LASIK & LASEK procedures?
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LASIK creates a permanent flap
LASEK uses a trephine for a thinner round cut |
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an add was estimated to be 2D for a WD of 35cm, how far from the spectacle plane is the patient's proximal point?
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58cm
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a pt reads at 40cm and has accommodative amplitude of +3.00 what is their total range of vision in their ideal bifocal add
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100cm to 25cm
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a distant obj subtends a visual angle of 0.25 radians. What would be the size of the retinal image formed in an uncorrected -10D (change to -5?) refractive myopic eye
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4.17mm
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according to Knapp's law, RSM = 1 when
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an axial ametrope is corrected with a lens positioned at the eye's anterior focal point
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what is the angular size of a 50ft letter when viewed at 100 ft
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2.5 minutes of arc
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what is the linear size of a 100 ft letter when viewed at 10ft
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4.4 cm
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what is the angular size of a 10ft letter when viewed at 40 ft?
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1.25 minutes of arc
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what is the linear size of a 10ft letter when viewed at 40ft
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0.44cm
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the following individuals are viewing a distant point source. assumming that the pts are uncorrected and unaccommodated, which one will have a retinal img that is oval in shape w/the long axis of the ellipse oriented vertically
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a cmpd hyperopic, A-t-R astigmat
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which of the following accurately describes the effect of fogging our patients on the duochrome test (Red-green test)
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fogging gurantees that a pt is not accommodating which places the red end of the chromatic interval closer to the retina
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which of the following is NOT an accurate description of the Stiles Crawford Effect?
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it explains why blue focuses in front & red focuses behind the retina
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complete this sentence. ultrasound is a wave which...
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has a higher frequency than sound
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the shadows of the central retinal artery and vein cause which entoptic phenomena?
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Purkinje's Tree
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ignoring the sign of its coefficient, which of the following variables shows the greatest correlation with refractive error
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axial length
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