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THE EYE
sclera
choroid
retina
fovea
optic nerve
arteries and veins
cornea
iris
pupil
lens
aqueous humour
ciliary muscle
suspensory ligaments
ciliary body
vitreous humour
eye muscle
BiologyMad.com
The Retina
The Retina
Contains photoreceptor cells (rods and cones) and associated interneurones and sensory neurones.
light
to opticnerve
ganglioncells
bipolarneurones
rodcells
conecells
pigmentedretina
BiologyMad.com
Visual Transduction
This is the process by which light initiates a nerve impulse.
The structure of a rod cell:
synapse nucleus m itochondria membrane disks
inner segment outer segment
BiologyMad.com
• Detection of light is carried out on the membrane disks
• These disks contain thousands of molecules of rhodopsin (photoreceptor molecule)
Common Eye Disease Refractive errors like nearsightedness
and farsightedness, astigmatism, presbyopia
Allergies to dust, pollution gases, pollen etc.
Infection of eye lids like stye, chalazion Squint Cataract Glaucoma Tumors Age related macular degeneration Diabetic and hypertensive retinopathy Optic nerve related disease www.eyeclinicpune.com
symptoms-
Headache Blurring of near or distance vision Watering from eyes, swelling Itching, redness, irritation. Twitching, fatigue Eye pain or pain deep in the socket Floaters (dots or web) Double vision, problem in night vision. www. eyeclinicpune.com
Refractive errors
Myopia- Rays from the distant object comes to
a focus in front of retina.
Hypermetropia -Rays from the object comes to a focus behind the retina.
Astigmatism -It is the refractive error in which the focusing of rays from far object is not the same in the different meridians of the refracting system of the eye.
Presbyopia- Physiological condition when the accommodative power of the normal lens become less.
TreatmentRefractive error can be corrected by
Spectacles Contact lenses LASIK
Allergies These are caused due to dust, increasing
pollution , toxic gases. These allergies might be seasonal e.g
summer (dust) or spring season (pollen grains).
Symptoms- redness, itching, watering, swelling of eyelids or lid margins.
Treatment is antiallergic eye drops and steroid eye drops.
Prevention of allergens .
www. eyeclinicpune.com
Infections
Stye is infection of hair follicle on eyelids. This
causes swelling and pain on lid margins
Chalazion is pea like swelling on the lids, this is due to chronic inflammation of mebomian glands of the eyelids.
Blephritis is chronic inflammation of eyelid margins leading to dryness and flaking. This gives rise to itching of eyes, lid margins and corner of eyes. Redness and dryness of eyes causes discomfort.
InfectionConjunctivitis - Bacterial, viral and allergic.
Keratitis - Infection of cornea. Sometimes leads to ulcer formation.
Uveitis- inflammation and infection of inner layers of eye, which is associated with other systemic disease like arthritis and tuberculosis etc. this if not diagnose in time can lead to permanent decrease of vision.
Symptoms are redness of eyes and reduction in vision. Discomfort in bright light and eye pain.
Treatment of infection and inflammation
Depends on the cause allergic or infection
Inflammation is treated by supportive treatment and tear substitute. Causative systemic disease has to be diagnosed and treated.
Infection is treated by oral and local antibiotics and antiviral. Painkillers and antacids are supportive modalities
Other disease in young adults.
Squint: Misalignment of visual axis or when both eyes
are not looking in the same direction. Paralytic or concomitant: Muscle paralysis or neurological reason. Treatment is evaluation, spectacles and
surgery.
Cataract
Opacity in the natural crystalline lens is called
cataract. Old age disease but can occur in newborn
babies and adults due to infection in intrauterine period or malnutrition. Certain metabolic disease also cause cataract in young.
Treatment is surgery phacoemulsification with artificial lens implantation.
Glaucoma
This is defined as raised intraocular
pressure Changes in the perimetery or visual field Change in optic nerve. Vision lost due to this is irreversible so
quick diagnosis and treatment is an answer Usually occurs in above 40 age group,
family history , hypermetropia Hypertension is a risk factor. Check your eye pressure on every visit to
an eye doctor ( if you are above 40 yrs )
Treatment: eye drops ,laser iridotomy,surgery.
Symptoms of glaucomacolored halos, redness, pain in eyes
Diabetic and hypertensive retinopathy
Retinopathy and cataract are commonest eye problem in diabetics.
Early diagnosis is required because there could be irreversible damage to eye site.
Retinopathy may lead to retinal detachment and glaucoma which can permanently damage eyesight.
If detected early patients can be managed medically by OCT, FFA and laser treatment
Complication of diabetes in eyes
Optic neuritis Optic nerve edema or papilloedema. Optic nerve atrophy.
OTHER EYE DISEASE LIKE Age related macular degeneration.Various benign and malignant tumors
www. eyeclinicpune.com