Optometry final exam 2024 (A+ GRADED)

emmetropia correct answers optical state of the eye in which parallel light enters the eye and focuses on the retina without the need for any corrective lenses or accommodation; this is the absence of refractive error and the "normal" or ideal state of the eye ametropia correct answers refractive error, "abnormal" optical state of the eye in which parallel light rays enter the eye and focus on an area other than the retina; this condition requires corrective lenses to produce clear retinal images astigmatism correct answers optical error in which refractive power is not uniform in all meridians; light entering the eye is focused at two distinct focal points where at least one focal point does not fall onto the retina How can corneal astigmatism be measured? correct answers keratometry What are components of sphere-cylinder lens RX? correct answers 1. Power (magnitude in D) of sphere component 2. Power (magnitude of D) of cylinder component 3. Axis (orientation) of the cylinder i.e. +2.00 -3.00 X 145 i.e. -5.00 -2.00 X 060 If one meridian is at 60 degrees, where is the other correct answers 150 degrees because 60+90=150 What are the possible values for magnitude of axis? correct answers 1 degree-180 degrees How can one determine the powers of the 2 principal meridians? correct answers Principal meridian 1=power of more (+) meridian Principal meridian 2=sum of sphere and cylinder componenets Find primary and secondary meridians for this Rx. +1.00 -2.00 X 110 correct answers Principal meridian 1=+1.00D Principal meridian 2=+1.00D + -2.00D= -1.00D Find the primary and secondary meridians for the Rx. -3.00 -4.50 X 010 correct answers Principal meridian 1= -3.00D Principal meridian 2= -3.00D + -4.50D= -7.50D Find the primary and secondary meridians for this Rx. +4.00 -6.50 X 175 correct answers Principal meridian 1= +4.00D Principal meridian 2= +4.00D - 6.50D= -2.50D What are the 8 different types of refractive error? correct answers 7 distance refractive errors which assume that accommodation is at rest and that the eye is looking at a distant target (optical infinity)