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(Department of Home and Health Sciences)
Course: Instruments Optics (494) Semester: Autumn, 2010
Level: B.Sc Credit: Half
CONTENT LIST
Dear Student,
You will find the following items in your study packets.
1. Study Guide (Unit 1-9)
2. Theory Assignments (1-2)
3. Practical Assignment (01)
4. Assignments Forms (09)
5. A Book named Instrument Optics written by Dr. Sajjad Haider.
6. Schedule for submitting assignments, Practicals and tutorials meetings.
Note: - If any one item from the above content list is missing from your study packet, kindly contact:
Mailing Officer
Mailing Section
Services and Operational Block
Allama Iqbal Open University
Sector H-8 Islamabad
Ph. 051-9057611–12
ALLAMA IQBAL OPEN UNIVERSITY , ISLAMABAD
(Department of Home and Health Sciences)
1. PLAGIARISM OR HIRING OF GHOST WRITER(S) FOR SOLVING THE ASSIGNMENT(S) WILL DEBAR THE STUDENT FROM AWARD OF DEGREE/CERTIFICATE, IF FOUND AT ANY STAGE.
2. SUBMITTING ASSIGNMENTS BORROWED OR STOLEN FROM OTHER(S) AS ONE’S OWN WILL BE PENALIZED AS DEFINED IN “AIOU PLAGIARISM POLICY”.
Course: Instruments Optics (494) Semester: Autumn, 2010
Level: B.Sc Credit: Half
Total Marks: 100 Pass Marks: 40
ASSIGNMENT No. 1
PART-A (Marks: 25)
Mark as True or False. (25)
1. Regarding retinoscope:
a) It is used for objective refraction.
b) “Against movement” of the retinal reflex always indicates hypermetropia.
c) The speed of retinal reflex is not related to the working distance.
d) A dim retinal reflex indicates low refractive error.
e) A slow retinal reflex indicates a high refractive error.
2. Regarding ophthalmoscopes:
a) These are used to examine the anterior chamber angle.
b) Indirect ophthalmoscopes are good for viewing peripheral retina.
c) Direct ophthalmoscopes give more magnification than indirect ophthalmoscope.
d) Direct ophthalmoscopes have an inbuilt light source in these.
e) The field of view is larger in indirect ophthalmoscope than the direct one.
3. Regarding cross cylinder:
a) It is used to roughly find the axis of astigmatic error and of the correcting cylinder.
b) Can’t be used in children.
c) It consists of two cylinders of exactly the same power.
d) It consists of two minus-cylinders.
e) It consists of two plus-cylinders.
4. Regarding Snellen vision charts:
a) Practical distance for assessing visual acuity is 60 meters.
b) These are not commonly used nowadays.
c) The numerator denotes the distance of the examiner from the chart.
d) The numerator denotes the distance for the patient from the chart.
e) If a patient can see the largest letter on Snellens chart, his vision is 6/6.
5. Regarding slit lamp and its accessories:
a) These are used to examine the anterior chamber of the eye only.
b) The light is directed from above onto the cornea.
c) While changing the bulb, the instrument should never be unplugged.
d) Hruby lens is used to examine the lens.
e) Pachymeter is used to measure corneal thickness.
PART-B (Total Marks: 75)
Q.1 What is a cross cylinder? How is it used? (15)
Q.2 Compare direct and indirect ophthalmoscopes regarding their properties. (15)
Q.3 Write a brief account on the design of slit lamp. (15)
Q.4 Write a comprehensive note on retinoscopy. (15)
Q.5 Describe the standard method to record visual acuity by using the Snellens visual chart. (15)
ASSIGNMENT No. 2
Total Marks: 100 Pass Marks: 40
PART-A (Marks: 25)
Mark as True or False. (25)
1. A keratometer measures:
a) The radius of curvature of the lens.
b) The radius of curvature of posterior surface of cornea.
c) The refractive power of cornea.
d) The thickness of cornea.
e) All of the above.
2. Regarding ophthalmic instruments:
a) A Focimeter measures power of the cornea.
b) A tonometer measures intraocular pressure.
c) A Synoptophore measures anterior chamber angle.
d) A keratometer measures depth of the anterior chamber.
e) Phoropter is a refractor.
3. Regarding Focimeter it measures:
a) The Dioptric vertex power of a lens.
b) The axis of the lens.
c) The optical center of the lens.
d) The presence of a prism.
e) None of the above.
4. Regarding Low Vision Aids:
a) Patients should be given the strongest aid in terms of magnification.
b) Patients should be given the weakest aid in terms of magnification.
c) Children require the same magnification as the adults.
d) The smaller, the glass area of the magnifier, the lesser is the magnification.
e) Binocular telescopes are preferred to monocular telescopes.
5. Regarding tonometers:
a) Goldman applanation tonometer is portable.
b) Schiotz tonometer is an applanation tonometer.
c) Perkin’s tonometer is an indentation tonometer.
d) Applanation tonometers are safer than the indentation tonometers.
e) Tonometers don’t need steralization.
PART-B (Marks: 75)
Q.1 What are the advantages and disadvantages of an automated refractor? (15)
Q.2 What is the basic principle of applanation tonometery? (15)
Q.3 What are the important points to be remembered while taking care of the slit lamp? (15)
Q.4 Briefly describe different parts of a Phoropter. (15)
Q.5 What are the advantages and disadvantages of the hand and stand magnifiers? (15)
PRACTICALS
1. Prepare a log book including the photographs of all the instruments along with their procedures. (150)
2. Viva voce examination. (50)
3. Total Marks: (200)