Night blindness is caused by: a. Central retinal vein occlusion b. Dystrophies of retinal rods c. Dystrophies of the retinal cones d. Retinal detachment

Night blindness is caused by: a. Central retinal vein occlusion b. Dystrophies of retinal rods c. Dystrophies of the retinal cones d. Retinal detachment
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ANSWER: B
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A patient of old standing diabetes mellitus noticed sudden muscae volitanes. On examination, the red reflex was dim, with no details of fundus could be seen. He might have: a. Non proliferative diabetic retinopathy b. Cystoid macular edema c. Vitreous hemorrhage d. Central retinal vein occlusion

Description : A patient of old standing diabetes mellitus noticed sudden muscae volitanes. On examination, the red reflex was dim, with no details of fundus could be seen. He might have: a. Non proliferative diabetic retinopathy b. Cystoid macular edema c. Vitreous hemorrhage d. Central retinal vein occlusion 

Last Answer : ANSWER: C 

A young patient with sudden painless loss of vision, with systolic murmur and ocular examination reveals a cherry red spot with clear AC, the likely diagnosis is: a. Central Retinal Artery Occlusion b. Central Retinal Vein Occlusion c. Diabetes Mellitus d. Branch Retinal Vein Occlusion

Description : A young patient with sudden painless loss of vision, with systolic murmur and ocular examination reveals a cherry red spot with clear AC, the likely diagnosis is: a. Central Retinal Artery Occlusion b. Central Retinal Vein Occlusion c. Diabetes Mellitus d. Branch Retinal Vein Occlusion  

Last Answer : ANSWER: A

100 days glaucoma is seen in: a. Central Retinal Artery Occlusion b. Branch Retinal Artery Occlusion c. Central Retinal Vein Occlusion d. Branch Retinal Vein Occlusion

Description : 100 days glaucoma is seen in: a. Central Retinal Artery Occlusion b. Branch Retinal Artery Occlusion c. Central Retinal Vein Occlusion d. Branch Retinal Vein Occlusion

Last Answer : ANSWER: C

A male patient 30 years old with visual acuity of 6/6 in both eyes. Twelve hours ago he presented with drop of vision of the left eye. On examination, visual acuity was 6/6 in the right eye and 6/60 in the left eye. Fundus examination showed blurred edges of the left optic disc. The most probable diagnosis is: a. Raised intra cranial pressure b. Raised ocular tension c. Central retinal artery occlusion d. Optic neuritis

Description : A male patient 30 years old with visual acuity of 6/6 in both eyes. Twelve hours ago he presented with drop of vision of the left eye. On examination, visual acuity was 6/6 in the ... : a. Raised intra cranial pressure b. Raised ocular tension c. Central retinal artery occlusion d. Optic neuritis

Last Answer : ANSWER: D

Occlusion of the lower nasal branch of the central retinal artery results in one of the following field defects: a. Lower nasal sector field defect b. Upper nasal sector field defect c. Upper temporal field defect d. Lower temporal sector field defect

Description : Occlusion of the lower nasal branch of the central retinal artery results in one of the following field defects: a. Lower nasal sector field defect b. Upper nasal sector field defect c. Upper temporal field defect d. Lower temporal sector field defect

Last Answer : ANSWER: C  

In Central retinal artery occlusion, a cherry red spot is due to: a. Hemorrhage at macula b. Increased choroidal perfusion c. Increase in retinal perfusion at macula d. The contrast between pale retina and reddish choroids

Description : In Central retinal artery occlusion, a cherry red spot is due to: a. Hemorrhage at macula b. Increased choroidal perfusion c. Increase in retinal perfusion at macula d. The contrast between pale retina and reddish choroids  

Last Answer : ANSWER: D

Commotio retinae is seen in: a. Concussion injury b. Papilloedema c. Central retinal vein thrombosis d. Central retinal artery thrombosis

Description : Commotio retinae is seen in: a. Concussion injury b. Papilloedema c. Central retinal vein thrombosis d. Central retinal artery thrombosis

Last Answer : a

Neovascular glaucoma follows: a. Thrombosis of central retinal vein b. Acute congestive glaucoma c. Staphylococcal infection d. Hypertension

Description : Neovascular glaucoma follows: a. Thrombosis of central retinal vein b. Acute congestive glaucoma c. Staphylococcal infection d. Hypertension

Last Answer : ANSWER: A 

Commonest lesion which hinders vision in diabetic retinopathy is: a. Macular oedema b. Microaneurysm c. Retinal hemorrhage d. Retinal detachment

Description : Commonest lesion which hinders vision in diabetic retinopathy is: a. Macular oedema b. Microaneurysm c. Retinal hemorrhage d. Retinal detachment  

Last Answer : ANSWER: A

In retinal detachment, fluid accumulates between: a. Outer plexiform layer and inner nuclear layer. b. Neurosensory retina and layer of retinal pigment epithelium c. Nerve fiber layer and rest of retina. d. Retinal pigment epithelium and Bruch’s membrane.

Description : In retinal detachment, fluid accumulates between: a. Outer plexiform layer and inner nuclear layer. b. Neurosensory retina and layer of retinal pigment epithelium c. Nerve fiber layer and rest of retina. d. Retinal pigment epithelium and Bruch’s membrane.  

Last Answer : ANSWER: B 

Commonest cause of posterior staphyloma is: a. Glaucoma b. Retinal detachment c. Iridocyclitis d. High myopia

Description : Commonest cause of posterior staphyloma is: a. Glaucoma b. Retinal detachment c. Iridocyclitis d. High myopia

Last Answer : ANSWER: D  

Optic nerve axon emerges from: a. Ganglion cells b. Rods and cones c. Amacrine cells d. Inner nuclear layer

Description : Optic nerve axon emerges from: a. Ganglion cells b. Rods and cones c. Amacrine cells d. Inner nuclear layer 

Last Answer : ANSWER: A

True statements about EOG (electro-oculogram) include: a. the EOG light-peak to dark-trough ratio is reduced in central retinal vein occlusion b. the light peak of EOG is abnormal in Best's disease c. the EOG light rise is produced by depolarization of the basal membrane of the retinal pigment epithelium d. all above

Description : True statements about EOG (electro-oculogram) include: a. the EOG light-peak to dark-trough ratio is reduced in central retinal vein occlusion b. the light peak of EOG is abnormal in Best' ... rise is produced by depolarization of the basal membrane of the retinal pigment epithelium d. all above

Last Answer : all above

Retinal vein occlusion?

Description : Retinal vein occlusion?

Last Answer : DefinitionRetinal vein occlusion is a blockage in the blood supply from the retina -- the light-sensitive tissue in the back of the eye.Alternative NamesCentral retinal vein occlusion; Branch retinal vein ... in all or part of one eyeSigns and testsTests to evaluate the retina include:Color visionE

Haemoglobin SC disease: a. is common amongst Afro-carribean people b. does not show sickle cells in the blood film. c. causes severe anaemia d. causes retinal vein occlusion

Description : Haemoglobin SC disease: a. is common amongst Afro-carribean people b. does not show sickle cells in the blood film. c. causes severe anaemia d. causes retinal vein occlusion

Last Answer : causes retinal vein occlusion

Which one of the following statements is not correct? (a) Retinal is the light absorbing portion of visual photopigments. (b) In retina the rods have the photopigment rhodopsin while cones have three different photopigments. (c) Retinal is a derivative of vitamin C. (d) Rhodopsin is the purplish red protein present in rods only.

Description : Which one of the following statements is not correct? (a) Retinal is the light absorbing portion of visual photopigments. (b) In retina the rods have the photopigment rhodopsin while cones have three ... a derivative of vitamin C. (d) Rhodopsin is the purplish red protein present in rods only.

Last Answer : (c) Retinal is a derivative of vitamin C.

The best treatment for amblyopia is: a. Orthoptic exercises b. Occlusion c. Surgery d. Best treat after age 10 years

Description : The best treatment for amblyopia is: a. Orthoptic exercises b. Occlusion c. Surgery d. Best treat after age 10 years

Last Answer : ANSWER: B 

Which is not found in papilloedema? a. Blurred vision b. Blurred margins of disc c. Cupping of disc d. Retinal edema

Description : Which is not found in papilloedema? a. Blurred vision b. Blurred margins of disc c. Cupping of disc d. Retinal edema

Last Answer : ANSWER: C 

Primary optic atrophy results from: a. Retinal disease b. Chronic glaucoma c. Papilledema d. Neurological disease

Description : Primary optic atrophy results from: a. Retinal disease b. Chronic glaucoma c. Papilledema d. Neurological disease

Last Answer : ANSWER: D

Retinal detachment repair?

Description : Retinal detachment repair?

Last Answer : DefinitionRetinal detachment repair is eye surgery to place a detached retina back into its normal position.A detached retina means the light-sensitive tissue in the back of the eye has separated from ... be done to repair it. Pneumatic retinopexy (gas bubble placement) is also usually an office

Retinal detachment?

Description : Retinal detachment?

Last Answer : DefinitionRetinal detachment is a separation of the light-sensitive membrane in the back of the eye (the retina) from its supporting layers.Causes, incidence, and risk factorsThe retina ... posterior vitreous detachment.During a retinal detachment, bleeding from small retinal blood vessels may clo

How long does retinal detachment laser surgery take to preform with the macula on?

Description : How long does retinal detachment laser surgery take to preform with the macula on?

Last Answer : Retinal detachment laser surgery takes about 10-15 minutes. Depending on the size of the tear, outpatient hospital sugery may be required. Depending on the type of pain that you are going through. The most common amount of time for the procedure is around two hours.

All the following associated open angle glaucoma include all the following except: a. Roenne’s nasal step b. Enlarged blind spot c. Generalized depression of isopters d. Loss of central fields e. Tubular vision

Description : All the following associated open angle glaucoma include all the following except: a. Roenne’s nasal step b. Enlarged blind spot c. Generalized depression of isopters d. Loss of central fields e. Tubular vision

Last Answer : ANSWER: D  

Band shaped keratopathy is commonly caused by deposition of: a. Magnesium salt b. Calcium salt c. Ferrous salt d. Copper salt

Description : Band shaped keratopathy is commonly caused by deposition of: a. Magnesium salt b. Calcium salt c. Ferrous salt d. Copper salt

Last Answer : ANSWER: B  

Retinal artery occlusion?

Description : Retinal artery occlusion?

Last Answer : DefinitionRetinal artery occlusion is a blockage of the blood supply in the arteries to the retina -- the light-sensitive tissue in the back of the eye.Alternative NamesCentral retinal artery occlusion; ... of the two large blood vessels in the neck (carotid artery disease)Disorder of high

The bright-flash ERG: a. comes only from the cones b. is generated in a fully dark adapted eye by the highest intensity of light c. can be used to assess the overall retinal integrity in the presence of media opacity d. is abnormal in patients with age-related macular degeneration

Description : The bright-flash ERG: a. comes only from the cones b. is generated in a fully dark adapted eye by the highest intensity of light c. can be used to assess the overall retinal integrity in the presence of media opacity d. is abnormal in patients with age-related macular degeneration

Last Answer : can be used to assess the overall retinal integrity in the presence of media opacity

What is the difference between Rods and Cones? -Biology

Description : What is the difference between Rods and Cones? -Biology

Last Answer : answer:

Outer most layer of retina which holds sensory neuron like rods & cones is

Description : Outer most layer of retina which holds sensory neuron like rods & cones is

Last Answer : Outer most layer of retina which holds sensory neuron like rods & cones is

Outer most layer of retina which holds sensory neuron like rods & cones is

Description : Outer most layer of retina which holds sensory neuron like rods & cones is

Last Answer : Outer most layer of retina which holds sensory neuron like rods & cones is

In the eye, colour vision is effected by the presence of - (1) Choroid coat (2) Sclerotic coat (3) Rods (4) Cones

Description : In the eye, colour vision is effected by the presence of - (1) Choroid coat (2) Sclerotic coat (3) Rods (4) Cones

Last Answer : (4) Cones Explanation: Cone cells, or cones, are photoreceptor cells in the retina of the eye that are responsible for color vision, they function best in relatively bright light, as opposed to ... , but quickly reduce in number towards the periphery of the retina. It allow the perception of colour

The colour of the eye depends upon the pigment present in - (1) cornea (2) iris (3) rods (4) cones

Description : The colour of the eye depends upon the pigment present in - (1) cornea (2) iris (3) rods (4) cones

Last Answer : (2) iris Explanation: Eye colour is a polygenic phenotypic character determined by 2 distinct factors: the pigmentation of the eye's iris and the frequency-dependence of the scattering of light by the ... iris stroma (located at the front of the iris), and the cellular density of the stroma.

Where is Rods and Cones present?

Description : Where is Rods and Cones present?

Last Answer : Retina

With regard to dark adaptation: a. is a quicker process than light adaptation b. the sensitivity of the cones increases more rapidly than the rods c. it is monophasic in rod monochromatism d. the first limb of the curve represents rod recovery

Description : With regard to dark adaptation: a. is a quicker process than light adaptation b. the sensitivity of the cones increases more rapidly than the rods c. it is monophasic in rod monochromatism d. the first limb of the curve represents rod recovery

Last Answer : it is monophasic in rod monochromatism

With regard to light perception: a. the fovea contains only cones b. the cones have a lower threshold to light than rods c. rods respond most to the red-yellow end of light d. rods respond most to wavelengths of about 500nm

Description : With regard to light perception: a. the fovea contains only cones b. the cones have a lower threshold to light than rods c. rods respond most to the red-yellow end of light d. rods respond most to wavelengths of about 500nm

Last Answer : rods respond most to wavelengths of about 500nm

True statement about dark adaptation include: a. there is a shift in peak spectral sensitivity from 555 nm to 505 nm with dark adaptation b. rods are more sensitive than cone during dark adaptation c. biphasic changes only occur in retina which processes both rods and cones d. all above

Description : True statement about dark adaptation include: a. there is a shift in peak spectral sensitivity from 555 nm to 505 nm with dark adaptation b. rods are more sensitive than cone during dark adaptation c. biphasic changes only occur in retina which processes both rods and cones d. all above

Last Answer : all above

Photoreceptors (Rods and cones) of eye are present in (a) Sclera (b) Cornea (c) Retina (d) Pupil

Description : Photoreceptors (Rods and cones) of eye are present in (a) Sclera (b) Cornea (c) Retina (d) Pupil

Last Answer : (c) Retina

Select the answer with correct matching of the structure, its location and function. Structure Location Function (a) Eustachian Anterior Equalizes air tube part of pressure on internal ear either sides of tympanic membrane (b) Cerebellum Midbrain Controls respiration and gastric secretions (c) Hypothal Forebrain Controls body -amus temperature, urge for eating and drinking (d) Blind spot Near the place Rods and cones where optic are present but nerve leaves inactive here the eye

Description : Select the answer with correct matching of the structure, its location and function. Structure Location Function (a) Eustachian Anterior Equalizes air tube part of pressure on internal ear either sides ... the place Rods and cones where optic are present but nerve leaves inactive here the eye

Last Answer : (c) Hypothal Forebrain Controls body -amus temperature, urge for eating and drinking

Parts A, B, C and D of the human eye are shown in the diagram. Select the option which gives correct identification along with its functions characteristics. (a) C-Aqueous chamber-Reflects the light which does not pass through the lens. (b) D - Choroid - Its anterior part forms ciliary body. (c) A - Retina - Contains photoreceptors, i.e., rods and cones. (d) B - Blind spot-Has only a few rods and cones.

Description : Parts A, B, C and D of the human eye are shown in the diagram. Select the option which gives correct identification along with its functions characteristics. (a) C-Aqueous chamber-Reflects the light which does not ... , i.e., rods and cones. (d) B - Blind spot-Has only a few rods and cones.

Last Answer : (c) A - Retina - Contains photoreceptors, i.e., rods and cones.

In mammalian eye, the ‘fovea’ is the center of the visual field, where (a) only rods are present (b) more rods than cones are found (c) high density of cones occur, but has no rods (d) the optic nerve leaves the eye.

Description : In mammalian eye, the ‘fovea’ is the center of the visual field, where (a) only rods are present (b) more rods than cones are found (c) high density of cones occur, but has no rods (d) the optic nerve leaves the eye.

Last Answer : (c) high density of cones occur, but has no rods

The light sensitive cells that respond to dim light are ________. a)cones b)rods c)cornea d)retina

Description : The light sensitive cells that respond to dim light are ________. a)cones b)rods c)cornea d)retina

Last Answer : b)rods

The colour of the eye depends upon the pigment present in (1) cornea (2) iris (3) rods (4) cones

Description : The colour of the eye depends upon the pigment present in (1) cornea (2) iris (3) rods (4) cones

Last Answer : iris

In the eye, colour vision is effected by the presence of : (1) Choroid coat (2) Sclerotic coat (3) Rods (4) Cones

Description : In the eye, colour vision is effected by the presence of : (1) Choroid coat (2) Sclerotic coat (3) Rods (4) Cones

Last Answer : Cones

Ocular disorders

Description : Corneal sensations are diminished in

Last Answer : herpes virus

In grades of binocular vision; grade 2 is: a. Simultaneous macular vision b. Fusion c. Stereopsis

Description : In grades of binocular vision; grade 2 is: a. Simultaneous macular vision b. Fusion c. Stereopsis

Last Answer : ANSWER: B  

In paralytic squint, the difference between primary and secondary deviation in the gaze of direction of the paralytic muscle: a. Increases b. Decreases c. Remains the same

Description : In paralytic squint, the difference between primary and secondary deviation in the gaze of direction of the paralytic muscle: a. Increases b. Decreases c. Remains the same  

Last Answer : ANSWER: A  

In concomitant squint: a. Primary deviation > Secondary deviation b. Primary deviation < Secondary deviation c. Primary deviation = Secondary deviation d. None of the above

Description : In concomitant squint: a. Primary deviation > Secondary deviation b. Primary deviation < Secondary deviation c. Primary deviation = Secondary deviation d. None of the above

Last Answer : ANSWER: C 

The only extraocular muscle which does not arise from the apex of the orbit is: a. Superior rectus b. Superior oblique c. Inferior oblique d. Inferior rectus

Description : The only extraocular muscle which does not arise from the apex of the orbit is: a. Superior rectus b. Superior oblique c. Inferior oblique d. Inferior rectus

Last Answer : ANSWER: C  

The action of inferior oblique is: a. Depression, extorsion, abduction b. Depression, extorsion, adduction c. Elevation, extorsion, adduction d. Elevation, extorsion, abduction

Description : The action of inferior oblique is: a. Depression, extorsion, abduction b. Depression, extorsion, adduction c. Elevation, extorsion, adduction d. Elevation, extorsion, abduction 

Last Answer : ANSWER: D

The action of superior rectus is: a. Elevation, intorsion, abduction b. Elevation, intorsion, adduction c. Elevation, extorsion, adduction d. Elevation, extorsion, abduction.

Description : The action of superior rectus is: a. Elevation, intorsion, abduction b. Elevation, intorsion, adduction c. Elevation, extorsion, adduction d. Elevation, extorsion, abduction. 

Last Answer : ANSWER: B 

All the following are extraocular muscle of eye except: a. Superior rectus b. Ciliary muscle c. Inferior oblique d. Superior oblique

Description : All the following are extraocular muscle of eye except: a. Superior rectus b. Ciliary muscle c. Inferior oblique d. Superior oblique

Last Answer : ANSWER: B