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Richa Mohan. UJAHM 2013, 01 (03): Page 1-5 Unique Journal of Ayurvedic and Herbal Medicines, 01(03), Nov-Dec 2013 1 UNIQUE JOURNAL OF AYURVEDIC AND HERBAL MEDICINES Available online: www.ujconline.net Review Article ROLE OF TARPANA KRIYA KALPA WITH TRIPHALA GHRITA IN THE TREATMENT OF COMPUTER VISION SYNDROME, A WIDESPREAD EYE COMPLAINT OF PRESENT SCENARIO Richa Mohan * Rajiv Gandhi Government Post Graduate Ayurvedic College, Paprola, Distt: Kangra H.P 176115, India Received 09-09-2013; Revised 08-10-2013; Accepted 30-10-2013 *Corresponding Author: Dr. Richa Mohan Rajiv Gandhi Government Post Graduate Ayurvedic College, Paprola, Distt: Kangra H.P 176115, India [email protected], Tel: 09736333669 ABSTRACT Today in 21 st century, we are living in a highly sophisticated environment. Computer is one of the most developed technologies which are used in present time by the children, the young and the old. More and more men are sitting in front of computer for longer and longer hours. Because computer is such a highly visually demanding task, but the eyes are still structured according to old hunting days and are unable to adjust themselves, which lead to discomfort coined as Computer Vision Syndrome- An emerging pandemic of 21 st century. Modern medicine doesn’t have any definite treatment for the particular problem hence the ayurvedic scholars take it as a challenge to cure it by our various therapies like tarpana, etc. Ashtang Hridya Uttar Sthan (13/11) has the reference of Triphala Ghrita which is used in the present study in the Kriya kalpa procedure called Tarpana, a local eye refreshing and nourishing therapy. Keywords: Computer: modern daily used instrument, Computer Vision Syndrome: 21 st century ocular as well as systemic disease, Kriyakalpa: local ocular therapies, Tarpana: one of the important kriya kalp of eye, Triphala Ghrita: rasayana, chakshushya, balya INTRODUCTION The remarkable strides achieved by man during the days of evolution and his phenomenal growth in unfolding the mysteries of nature relied greatly on his capacity to react to the environment. He succeeded in mastering entire animal world due to his fully evolved senses; among them Eyes share a greater role than the rest. As eyes are the gateways of external world, visual defects tantamount to the obliteration of the world. It is no wonder that a text as old as Atharva Veda exclaims, “May Surya, the Sovereign Lord of eyes protect me” The eyes are said to be most important than all other Indriyas. They are considered as the reflectors of the mind. Eyes are the most precisely developed portions of the brain seen outside the skull. With the march of time, most of the dietary habits, social structure, life-style and environment have been changing. Computer is one of the most developed technologies which are used in present time by the children, the young and the old. The human vision system is not designed for long hours of computer viewing. So these lifestyles changes lead to discomfort called Computer Vision Syndrome (CVS). It is a complex of eye and vision problems related to near work which are experienced during or related to computer use. It is a repetitive strain disorder that appears to be growing rapidly. Some studies estimate that 90% of US workforce using computer for more than 3 hours per day experience CVS in some form.CVS is not a single disease entity but it is a group of symptoms mainly of Eye strain Dry eye Blurred vision Headache No remedial measures for cure of this pathology prevail in the domain of modern medicine.

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Richa Mohan. UJAHM 2013, 01 (03): Page 1-5

Unique Journal of Ayurvedic and Herbal Medicines, 01(03), Nov-Dec 2013 1

UNIQUE JOURNAL OF AYURVEDIC AND HERBAL MEDICINES Available online: www.ujconline.net

Review Article

ROLE OF TARPANA KRIYA KALPA WITH TRIPHALA GHRITA IN THE

TREATMENT OF COMPUTER VISION SYNDROME, A WIDESPREAD EYE

COMPLAINT OF PRESENT SCENARIO Richa Mohan*

Rajiv Gandhi Government Post Graduate Ayurvedic College, Paprola, Distt: Kangra H.P 176115, India

Received 09-09-2013; Revised 08-10-2013; Accepted 30-10-2013

*Corresponding Author: Dr. Richa Mohan

Rajiv Gandhi Government Post Graduate Ayurvedic College, Paprola, Distt: Kangra H.P 176115, India [email protected], Tel: 09736333669

ABSTRACT

Today in 21st century, we are living in a highly sophisticated environment. Computer is one of the most developed technologies which are used in present time by the children, the young and the old. More and more men are sitting in front of computer for longer and longer hours. Because computer is such a highly visually demanding task, but the eyes are still structured according to old hunting days and are unable to adjust themselves, which lead to discomfort coined as Computer Vision Syndrome- An emerging pandemic of 21st century. Modern medicine doesn’t have any definite treatment for the particular problem hence the ayurvedic scholars take it as a challenge to cure it by our various therapies like tarpana, etc. Ashtang Hridya Uttar Sthan (13/11) has the reference of Triphala Ghrita which is used in the present study in the Kriya kalpa procedure called Tarpana, a local eye refreshing and nourishing therapy. Keywords: Computer: modern daily used instrument, Computer Vision Syndrome: 21st century ocular as well as systemic disease, Kriyakalpa: local ocular therapies, Tarpana: one of the important kriya kalp of eye, Triphala Ghrita: rasayana, chakshushya, balya

INTRODUCTION

The remarkable strides achieved by man during the days of evolution and his phenomenal growth in unfolding the mysteries of nature relied greatly on his capacity to react to the environment. � He succeeded in mastering entire animal world due to his

fully evolved senses; among them Eyes share a greater role than the rest.

� As eyes are the gateways of external world, visual defects tantamount to the obliteration of the world. It is no wonder that a text as old as Atharva Veda exclaims,

“May Surya, the Sovereign Lord of eyes protect me” � The eyes are said to be most important than all other

Indriyas. They are considered as the reflectors of the mind.

� Eyes are the most precisely developed portions of the brain seen outside the skull.

� With the march of time, most of the dietary habits, social structure, life-style and environment have been changing.

� Computer is one of the most developed technologies which are used in present time by the children, the young and the old. The human vision system is not designed for long hours of computer viewing. So these lifestyles changes lead to discomfort called Computer Vision Syndrome (CVS).

� It is a complex of eye and vision problems related to near work which are experienced during or related to computer use.

� It is a repetitive strain disorder that appears to be growing rapidly. Some studies estimate that 90% of US workforce using computer for more than 3 hours per day experience CVS in some form.CVS is not a single disease entity but it is a group of symptoms mainly of

� Eye strain � Dry eye � Blurred vision � Headache � No remedial measures for cure of this pathology prevail in

the domain of modern medicine.

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So this is a challenge to ayurvedic scholars as we believe nature provides the disease and drug both, by virtue of which we can cure the symptoms of CVS to a large extent.

• A clinical study on the effect of Tarpana Karma with trial drug was done comparing it with the effects of counseling of the preventive measures.

• Modern scientific approach was applied for diagnosis of disease, and assessment of results while working within the parameters of original text.

• Acharya Charak in Charak Samhita has clearly given guidelines for identification as well as treatment of the diseases.

• Diseases, not mentioned in the text and if the name of the disease is not known do not mean that it cannot be cured (Ch. Sa. Su. 18/44-47)

• A systemic approach with regards to etiology (Doshas), site (Dushya/Adhisthan) and Lingam (Clinical features) will lead a physician to permanent cure of the disease.

• CVS is a Vata dominating Pittaja ocular as well as a systemic problem and it can be named "SANGANAKA ATIYOGAJANYA NETRA SAMLAKSHANA".

• Acharya Charak said that to understand a disease one should go through Nidana Panchaka. So to understand the symptomatology of CVS probable nidan panchaka will be discussed here.

• Nidana

• r= funkua dkj.kfeR;qäexzsA (Ch. S. Ni. 1/7) • In CVS cause of different symptoms is due to excessive

working on computer. • Pragyaapradha

bfr f=fo/kfodYia f=fo/keso deZ çKkijk/k bfr O;oL;sr~A ¼ p- lw 11@4½

Extensive computer work without thinking about eye capability and body stamina and not taking appropriate precautions while working on computer. • Asatmyaindriyartha samyoga

• Overuse of eyes, less blinking during working on computer and without using antiglare screen all these things causes asatmya chakshu indriya samyoga with teja (different intensity of light emitted from computer screen).

• Parinaam

• dky% iqu% ifj.kke mP;rsA (Ch. S. Su. 11/42) Working more on computer will produce more symptoms means severity of disease is directly proportional to duration of working on computer Poorvaroopa

r=kfoya llajEHkeJqd.Mwinsgor~ A xq:’kkrksnjkxk|StqZ"VÜpkO;äy{k.kS%A Lk'kwya oREkZdk"ks"kq 'kwdiw.kZkHkesop A fogU;ekua :is ok fØ;kLof{k ;Fkk iqjkA n`"VoSo /kheku~ cq/;sr~ nks"ks.kkf/kf"Bra rq rr~AA (Su. Ut.

1/21-23) • Few of above poorvroopa are also present in prodromal

symptoms of CVS like: • Aavilam - A patient of CVS may have altered eye texture

because of constant eye strain and asthenopia. • Sasarambh – A patient of CVS may feel foreign body

sensations or atypical discomfort in eye.

• Kandu – A patient of CVS may have itching as a symptom because of eye strain.

• Guru – A patient of CVS may have heaviness in eyes because of eye fatigue.

• Usha, Toda- A CVS patient may experience burning sensation and pain in eyes.

• Sashulam vartam koshaishu – This may be atypical symptom perceived by a CVS patient.

• Sukapurnabham –This can be correlated with foreign body sensation which is a common feature of CVS.

• VihanyaManam rupe va kriya swakshi yathapura – • It means visual acuity of a CVS patient usually

deteriorates if preventive measures are not used. • Therefore in Ayurvedic text what Maharishi Shushruta

had mentioned in poorvarupa of Netra roga, some of them also resembles as in a patient of CVS. It is other thing that the terminology is different.

• Roopa

• çknqHkwZry{k.ka iquÆyaxe~A (Ch. S. Ni. 1/9) • As CVS is not mentioned anywhere in Ayurvedic texts

but here symptomatology of CVS will be discussed on modern grounds with Ayurvedic references.

• Eye Strain

• Eye strain is a very common feature of CVS. It is due to constant and continued focusing by ciliary muscles, which create fatigue and lead to tired eyes or eye strain.

• Blurred vision

• It occurs due to accommodative spasm of cillary body. vO;Drkfu :ikf.k lokZ.;so çi';frA (Su. Sa. Ut. 7/6)

• Dry eye-

• Dry eye in a patient of CVS is due to exposure of cornea to reflected light energy which causes tear film abnormality by early evaporation of tears. This also decreases tear film break up time (T-BUT). In ayurvedic texts dry eye is mentioned in various terms.

• fo'kq"dHkko (Su. Ut. 6/6) • 'kq"dkYik (As. Hr. Ut. 15/2) • Headache –

• Usually headache is due to stress. In ayurvedic text various terms have been used like

• f'kjks:tks·frA (Su. Ut. 6/27) • Excessive fatigue (Neck/shoulder/Back pain) • These symptoms in a patient of CVS are due to constant

sitting posture, overuse of muscles of neck/shoulder and fingers. In ayurveda, excessive use of muscle or ativyayama leads to such symptoms. Ativyayama also vitiates vata and pitta which is the cause of neck/shoulder/back and finger pain.

• So, by above discussion we can say that although computer vision syndrome (CVS) as such not mentioned in Ayurveda but its symptoms are described in various diseases. Most of the symptoms are vata and pitta predominant. So, the line of treatment for CVS should be vata pittahara.

• UPSHYAYA

• mi'k;% iqugsZrqO;kf/kfoijhrkuka foijhrkFkZdkfj.kka • pkS"k/kkgkjfogkjk.kkeqi;ksx% lq[kkuqcU/k%A (Ch. S.

Ni.1/10 )

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• Means medicines, food items and activities which give feeling of wellbeing to the patient are known as upshyaya.

• In CVS patient upshyaya is eye rest, sound sleep, fresh air, vitamin C, vitamin A rich food like Triphla, ghee, papaya, aloevera, tarpana karma, ocular and head massage (samvahana) and soothing netra bindu (aschyotana).

SAMPRAPTI

Indulgence in Atiyoga and Mithyayoga of Chakushurindriya

Aggravation of Vata pradhana Pitta Dosha Sthana samshraya of Vitiated Vatapradhana Pitta Dosha in Sareera (Netra, Shira as well as Sarvadeha) and Mana

Precipitation of Symptoms of CVS

CHIKITSA

• Treatment concept of CVS in Ayurvedic aspects can be taken from various references as most of the symptoms of CVS are Vata and Pitta dominant so main line of treatment should be vatapittahara. fLuX/kSfgeSÜp e/kqjSÜp rFkk ç;ksxS%AA (Su. Ut. 19/4) Lkw;ksZijkxkuyfo|qnkfnu foyksdus uksigrs{k.kL;A lUriZ.ka fLuX/kfgekfn dk;ZaA rFkkatua gse Ä`rsu Ä`"Ve~AA (As. Hr. Ut. 13/37)

• So, by above references we can say that main line of treatment in a patient of CVS should be santarpana,snigdha aushadhi, parisheka, nasya, akshitarpana and in addition to that symptomatic treatment should also be done by using yukti (intelligence of physician). Lka{ksir% fØ;k;ksxks funkuifjotZueA Okkrknhuka çrhÄkr% çksäks foLrjr% iqu% AA (Su. Ut. 1/25)

MODERN REVIEW

INTRODUCTION

• People who sit in front of computer for long periods of time often encounter a variety of uncomfortable symptoms. Headache, neck strain, backache and wrist pain are common, but, sadly, the most prevalent symptoms of prolonged computer use—eye strain, blurred vision and dry eye—are often overlooked.

CVS-Definition

The American Optometric Association defines CVS as “the complex of eye and vision problems related to near work that are experienced during or related to computer use.” Sitting at a computer generally causes a person to look straight ahead for long stretches, work in a dry office or home environment, and to blink less often. These factors can lead to vision problems.

ETIOLOGY

� The etiology revolves around pathology � in accommodation, and � formation of tear film,

� decreased involuntary blinking and � up to some extent to visual pathway ACCOMMODATION

• Definition: As we know that in an emmetropic eye, parallel rays of light coming from infinity are brought to focus on the retina, with accommodation at rest. Our eyes have been provided with a unique mechanism by which we can even focus the diverging rays coming from a near object on the retina in a bid to see clearly. This mechanism is called accommodation.

• Excessive accommodation as in continuous work on VDUs may lead to accommodation spasm which causes the symptoms like image blurr, fatigue, eye strain and headache.

Tear Film

• A preocular layer of tear that is adhered to ocular surface. • Triple layered structure(Holly and Lamp,1971) • Intergrated aqueous and mucin gel structure. • Triple layer structure is useful in defining pathophysiology • CVS symptoms like dry eye as per seems to be due to

evaporative dry eye because working on the VDUs without involuntary blinking leads to evaporation of tears .Thus causing the features of dry eye like FBS (foreign body sensation) and burning sensation etc.

SYMPTOMS

• eyestrain • headache • blurred vision • dry eye • neck and shoulder pain

These symptoms may be caused by: • poor lighting • glare on the computer screen • improper viewing distances • poor seating posture • uncorrected vision problems • a combination of these factors SIGNS

• Conjunctiva- Hyperemia • Tear Film-Decreased tear meniscus/mucin debris • Cornea-Decreased corneal sheen, Epithelial keratopathy,

filaments and mucous plaques(in severe DES) MANAGEMENT

• Proper body positioning for computer use. This includes lighting conditions, chair comfort, location of reference materials, position of the monitor, and use of rest breaks.

• Location of computer screen Optimally, the computer screen should be 15 to 20 degrees below eye level (about 4 or 5 inches) as measured from the center of the screen and 20 to 28 inches away from the eyes

• Blinking - To minimize your chances of developing dry eye when using a computer, make an effort to blink frequently

• Anti-glare screens - If there is no way to minimize glare from light sources, consider using a screen glare filter.

• Rest breaks - To prevent eyestrain, try to rest your eyes when using the computer for long periods. 20-20-20 Rule.

• Use of artificial tears or contact lens wetting solution:-

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• To keep eyes moist thus relief from symptoms of dry eyes. Instill one drop of either artificial tears in the eyes regularly four times a day or as per symptoms.Tarpana kriya kalpa

• Tarpana is the most revered KriyaKalpa extensively used in Netra practice.

• It nourishes the eyes, improves & strengthens the Drishti Shakti.

• It is a very effective, preventive & curative procedure in Vataja & Pittaja vikaras.

• It is a procedure in which Sneha or Ghrita is poured into a well designed round the eye for a stipulated period.

• Ghrita that is selected for therapy should be warmed by placing the container in hot water.

• This Luke warm Ghrita in liquid state is poured through sterile cotton dipped in Ghrita into the parimandala till the eye lashes level with eye closed.

• Patient is asked to open & close the eye intermittently & steadily for a stipulated period.

• So, Local therapy in the form of Tarpana with Triphala Ghrita has been selected for the clinicmanagement of CVS.

Effect of Tarpana Kriya Kalpa: –

(Su.Sa.Ut 18/13) (Sha.Ut.Kh.13/50) (A.H.Su.24/11)

• Good (Sound) Sleep • Sleep satisfaction • Reduction in discharge • Clearness of vision • Healthy eye movements • Ability of eye to tolerate sunlight

CONCLUSION

The symptoms and complaints of the patient of CVS clearly indicate the vitiation of Vata and pitta doshaswhich pacifies these doshas should be advocated to provide relief in the symptoms. As per the given fundamental regarding naming an unknown disease, CVS may be coined as “Sanganak Atiyogajanya Netra Samlakshana”.

� Tarpana karma with Triphala Ghrita is effective in reliving different ocular symptoms.

� Only Tarpana karma was less effective in certain feature like headache and blurred vision.

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Ayurvedic and Herbal Medicines, 01(03), Nov-Dec

To keep eyes moist thus relief from symptoms of dry eyes. Instill one drop of either artificial tears in the eyes regularly four times a day or as per symptoms.

arpana is the most revered KriyaKalpa extensively used

It nourishes the eyes, improves & strengthens the Drishti

It is a very effective, preventive & curative procedure in

a or Ghrita is poured into a well designed round the eye for a stipulated period. Ghrita that is selected for therapy should be warmed by

This Luke warm Ghrita in liquid state is poured through hrita into the parimandala till the

Patient is asked to open & close the eye intermittently &

So, Local therapy in the form of Tarpana with Triphala Ghrita has been selected for the clinical trial of

(Su.Sa.Ut 18/13) (Sha.Ut.Kh.13/50) (A.H.Su.24/11)

The symptoms and complaints of the patient of CVS clearly pitta doshas. So a therapy

should be advocated to provide

aming an unknown Sanganak Atiyogajanya

is effective in

was less effective in certain feature

� Changing the lifestyle by preventive measures and counseling is least effective. Thus it can be concluded that this effective in management of CVS thus making it a point that cost effective and preservative free can be developed for this condition.

REFERENCES

1. Astanga Hridaya of Vagbhatta: Sundara commentary, by Pt. Shastri; Ist edi. (1990), Motilal Banarasidas Publishers, Delhi.

2. Astanga Samgraha of Acharya Vagbhatta commentary, by Dr. D.VPandit Rao and Vd. Ayodhya Pandey.

3. Astanga Samgraha of Vriddha Vagbhatta: commentary by Pt. Lal Chandra Shastri Vaidya; 1st edi (1989), Sh. Baidyanath Ayurveda Bhawan.

4. Bhava Prakasha : Vidyotini Comm. By Shri Brahma Shankar, Chaukhamba Sanskrit Series Office , Varanasi Ist Part (1969), (V.Ed.).

5. Baghel M.S: Researches in Ayurveda; (2005), Mridu Ayurvedic Publication and

6. Bhava Mishra : Bhava Prakash commentaryBrashmasankra Mishra. Chaukhamba Sanskrit Sansthan Varanasi.

7. Charak Samhita of Agnivesha: translation by Dr. PV Sharma; Chaukhambha Orientalia, Varanasi.

Dec 2013 4

Changing the lifestyle by preventive measures and

Thus it can be concluded that this Tarpana Kriya Kalpa is effective in management of CVS thus making it a point that cost effective and preservative free Ayurvedic therapy can be developed for this condition.

REFERENCES

Astanga Hridaya of Vagbhatta: With Sarvanga Sundara commentary, by Pt. Vaidya Lalchandra Shastri; Ist edi. (1990), Motilal Banarasidas Publishers,

Astanga Samgraha of Acharya Vagbhatta : With Indu D.VPandit Rao and Vd. Ayodhya

Astanga Samgraha of Vriddha Vagbhatta: With Chandra Shastri Vaidya; 1st edi

(1989), Sh. Baidyanath Ayurveda Bhawan. Prakasha : Vidyotini Comm. By Shri Brahma

Shankar, Chaukhamba Sanskrit Series Office , Varanasi Ist Part (1969), (V.Ed.).

Researches in Ayurveda; (2005), Mridu Ayurvedic Publication and Sales, Jamnagar. Bhava Mishra : Bhava Prakash commentary by Brashmasankra Mishra. Chaukhamba Sanskrit

Charak Samhita of Agnivesha: With English translation by Dr. PV Sharma; 1st edi.(1981), Chaukhambha Orientalia, Varanasi.

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8. Charaka Samhita of Agnivesha: Revised by Charaka and Dradhbala with the Ayurveda Deepika commentary of Chakrapani Dutta, edited by Vaidya Yadavaji TrikramjiAcharya; Istedi. (2004), Chaukhambha Orientalia, Varanasi.

9. Charaka Samhita of Agnivesha: With commentary by Pt. Kashinath Pandey and Dr. Gorakhnath Chaturvedi Vol Ml; Istedi. With reprint (1998), Chaukhambha Bharati Academy, Varanasi.

10. Chaudhury R.C.: Illustrated Shalakya Vigyana;XVIth edi. (2002), Chaukhambha Orientalia. Varanasi.

11. Kaiyadeva Nighantu : By Prof. P.V. Sharma and Dr. Guru Prasad Sharma. Chaukhamba Orientalia, Varanasi 1979).

12. Madhava Nidana by Acharya Madhavakara: With Madhukosha commentary by Shri Vijaya Rakshita and Shri Kantha Dutta and Hindi commentary by Pt. Brahmashankar Shastri Bhishagaratna; llIrd edi. (1993), Chaukhambha Sanskrit Sansthan, Varanasi.

13. P. V. Sharma : Ayurved ka Vaigyanik Itihas 2nd Edi., Chaukhamba orientalia varanasi.

14. Raj Nighantu : By I.D. Tripathi, K. Das Academy, Varanasi.

15. Sharma P.V.: Dravya Guna Vigyan vol. Ill and IV; XlVth edi. (1993), Chaukhambha Sanskrit Sansthan,

Varanasi. 16. Sushruta Samhita of Maharishi Sushruta : With

commentary by Kaviraj Ambikadutta Shastri; Xlth edi. (1997), Chaukhambha Sanskrit Sansthan, Varanasi.

17. Sushruta Samhita of Maharishi Sushruta : With English translation by K.L.Bhishagaratna vol.Ill;(1991),Chaukhambha Orientalia, Varanasi.

18. Sushruta Samhita of Maharishi Sushruta : With the Nibandh Samgrah commentary by Shri Dalhanacharya, edited by Vaidya Yadavaji Trikramji Acharya; (2003), Chaukhambha Surbharati Prakrashan, Varanasi.

19. Yog Ratnakar: With commentary by Vaidya Lakshmipati Shastri; llnd edi. (1973), Chaukhambha Sanskrit Series, Varanasi.

20. Aggarwal Lalit P.: Aggarwal’s principles of optics and refraction

21. A.K. Khurana : Anatomy and Physiology of eye 1st Edition.

22. A.K. Khurana: Clinical Ophthalmology 3rd edition. 23. Albert and Jakobiec: Principles and Practice of

Ophthalmology. 24. American optometric Association Optometric clinical

practice guidelines 25. Basak Samar K: Essentials of Ophthalmology 2nd Edi.

Source of support: Nil, Conflict of interest: None Declared