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             \author[1]{Dr. Kavita  Rathore}

             \author[2]{Dr. Manish  Choudhari}

             \author[3]{Dr. Naresh  Jain}

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\date{\small \em Received: 3 February 2021 Accepted: 4 March 2021 Published: 15 March 2021}

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\begin{abstract}
        


There are five sense organs (Panch Gyanendriya) mentioned in Ayurvedic Samhitas i.e. eye(chakshu), ear(shrota), nose(ghrana), tongue(rasana) and skin(twak). One of these is eye (Drishti) which is most important sense organ in our body. Acharya Sushruta the eminent Ayurveda region, has described the Drishti very accurately in his treatise Sushruta Samhita. There are six Netra Patala told in Ayurvedic classics which can be anatomically correlated with different layers of eyes as explained in modern ophthalmology. Drishti is a controversial word in Shalakya Tantra, a lot of meanings of Drishti have been taken in the Sushruta Samhita1. So Drishti can be simply considered as the functional unit of eye, which performs vision. It is not mere an anatomical structure but the composition of all the essential dhatus of internal eye ball.In ancient Ayurvedic scriptures have explained Netra Rachna Sharir and Kriya Sharir in a beautiful descriptive manner, still there is need of exploring the terminologies for proper understanding of pathogenesis of Netra Rogas and their managements so that implementation of Ayurvedic concepts can be done in eradication of Drishtigata Rogas in a fruitful manner to serve the humanity.

\end{abstract}


\keywords{drishti, sense organ, acharya sushruta.}

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\let\tabcellsep& 	 	 		 
\section[{A Conceptual Study of Drishti in Ayurvedic and}]{A Conceptual Study of Drishti in Ayurvedic and}\par
Modern Point of View Dr. Kavita Rathore ? , Dr. Manish Choudhari ? \& Dr. Naresh Jain ?\par
Abstract-There are five sense organs (Panch Gyanendriya) mentioned in Ayurvedic Samhitas i.e. eye(chakshu), ear(shrota), nose(ghrana), tongue(rasana) and skin(twak). One of these is eye (Drishti) which is most important sense organ in our body. Acharya Sushruta the eminent Ayurveda region, has described the Drishti very accurately in his treatise Sushruta Samhita. There are six Netra Patala told in Ayurvedic classics which can be anatomically correlated with different layers of eyes as explained in modern ophthalmology. Drishti is a controversial word in Shalakya Tantra, a lot of meanings of Drishti have been taken in the Sushruta Samhita \hyperref[b1]{1} . So Drishti can be simply considered as the functional unit of eye, which performs vision. It is not mere an anatomical structure but the composition of all the essential dhatus of internal eye ball.In ancient Ayurvedic scriptures have explained Netra Rachna Sharir and Kriya Sharir in a beautiful descriptive manner, still there is need of exploring the terminologies for proper understanding of pathogenesis of Netra Rogas and their managements so that implementation of Ayurvedic concepts can be done in eradication of Drishtigata Rogas in a fruitful manner to serve the humanity.\par
Keywords: drishti, sense organ, acharya sushruta.\par
I. 
\section[{Introdution}]{Introdution}\par
halakya Tantra is an important branch in Ashtang Ayurveda which deals with the diseases manifesting above supraclavicular region (Urdhwajatrugata roga) \hyperref[b0]{2} . Netra Sharira deals with three major parts of eye-Mandala, Sandhi and Patala 3 . Amont five Drishti Mandala is one which is situated in the innermost part of eyeball and in context with this all Drishtigata Rogas have been described. Drishti is made up of Panchamahabhuta, but Teja mahabhuta is predominant in the form of Alochaka Pitta. There are two types of Alochaka pitta-1.Chaksyu vaisheshika vaisheshika (Higher visual center-image analysed and perceived by buddhi). Drishti is an important part of eye and in classics it is interpreted in various aspects.\par
1. Drishti (Retina) 2. Drishti (Vision) 3. Drishti mandala (Pupil) 4. Drishti mani (Crystalline lens) Drishti (Retina, Optic nerve)-Some drishtigata rogas like Shleshma vidagdha drishti, Dhumdarshi, Pitta vidagdha drishti, Nakulandhya, Haswajadya, Gambhirika can only be explained if drishti word is taken as retina or optic nerve.\par
Drishti (Vision or power to see things)-Acharya Sushruta has explained that Adhimantha destroys the drishti if not treated well in time  {\ref 4} . From this fact it can be deduced that drishti is the power to see things. Drishti mandala (Pupil)-Acharya Sushruta has described five Mandala's in the eye out of which innermost one is Drishti mandala 5 . Drishti Mandala is said to be situated just next to Krishna Mandala. As per modern ophthalmology the eyeball comprises three coats 6 :\par
Outer (Fibrous coat): anterior 1/6th cornea and posterior 5/6th sclera Middle (vascular coat): ciliary body, iris, choroid Inner (nervous coat): retina Also according to modern ophthalmology as we go anteroposteriorly, the structure next to cornea is pupil.\par
Pramana of Drishti Mandala: Size of drishti as per Sushruta acharyas 7 is 1/7th of Krishna Mandala. At some places it is written 1/9th of Krishna Mandala 8 . This is in accordance with the fact that pupil is reactive to light and always keep constricting and dilating physiologically. In other words, pupil size is not constant throughout a day. Moreover, drishti is vivarakriti 9 which means like a hole or like a shutter of camera, this supports that drishti is pupil.\par
Drishti mani (Crystalline lens)-Intraocular crystalline lens placed in posterior chamber of eye ball. As per Sushruta Samhita drishti is masoordal tulya 9 (similar to cotyledons of pulses in shape), which is biconvex in shape. It supports the fact that Drishti is lens as lens is biconvex 10 in shape. 
\section[{II.}]{II.}\par
Aim and Objective According to Ayurveda the vitiated doshas travel through siras and reach the eye then get localized in the vartmapradesha, sita-asitamandala, sarvakshi or drishti and different diseases of eye are manifested. It is described in Sushruta Samhita that Drishti as a structure itself is covered externally with outer coat (Avrataam bahayen patalen akshi).It has also been told by Acharya Sushruta that while doing Agnikarma (thermal cauterization) on vartma (lids), Drishti should be covered with wet gauze (Drishti achchhadana)  {\ref 14} . According to Acharya Charaka also there is indication for Mridusweda (mild fomentation) for Drishti by covering it with padmautpalapatra (leaves of lotus) (Drishti swedayeta mridu naiv va)  {\ref 15} . Here Drishti can be considered as an anatomical entity. Appearance of Drishti has been described as glow like a lightening bug or that of minute particle of fire (Khadhyota visfulingabha). Structure of Drishti has been explained as a hole or aperture (Vivarakriti)  {\ref 16}   
\section[{c) Drishti in Modern View 24}]{c) Drishti in Modern View 24}\par
In Modern Ophthalmology there are few structures related to vision which can be comparable to the description given in Ayurvedic texts for Drishti. Structures related to visual axis and vision are as following-Cornea: Cornea is a clear, transparent and elliptical structure with a smooth shining surface. 
\section[{Aqueous humour:}]{Aqueous humour:}\par
The aqueous humour is a clear watery fluid filling the anterior chamber (0.25 ml) and posterior chamber (0.06 ml) of the eyeball. It plays an important metabolic role by providing substrates and by removing metabolites from the avascular cornea and lens. It maintains optical transparency.\par
Pupil: Pupil is central opening in the iris and its size varies between 1and 8mm. Constriction of pupil regulates the entry of light inside the eye and allows the retina to adapt to the changes in the illumination 25 . 
\section[{Name}]{Name}\par
Constituting factor Lens: The lens is a biconvex and transparent structure. The lens has nodal point (optical centre of lens) on its posterior part through which rays of light passes to retina.\par
? Acharya Vaghbhata used term Drishti Mushita darshanam for loss of vision in Aupsargika Lingnasha  {\ref 22} . AcharyaSushruta used term Drishti runaddhi for loss of vision in Linganasha 23 .\par
Retina: It is the innermost tunic of the eyeball and the most highly-developed tissue and consists of 10 layers. Grossly it is divided into two distinct regions: Posterior Pole and Peripheral Retina separated retinal equator.\par
The posterior region of the retina is called the posterior pole, the posterior pole of the retina consists of two regions: the macula lutea and the optic disc.\par
Optic disc: The optic disc is also called the "blind spot" or the "physiological blind spot". It is called this because there are no receptors in this part of the retina. This is where all of the axons of the ganglion cells exit the retina to form the optic nerve. There are no light sensitive rods or cones to respond to a light stimulus at this point.\par
Macula lutea: It is about 5.5 mm in diameter. Fovea centralis is the central depressed part of the macula. It is about 1.5 mm in diameter and is the most sensitive part of the retina. In its centre is a shining pit called Foveola (0.35 mm diameter) which is situated about 2-disc diameters (3 mm) away from the temporal margin of the disc and about 1 mm below the horizontal meridian. An area about 0.8 mm in diameter (including foveola and some surrounding area) does not containing retinal capillaries and is called foveal avascular zone (FAZ).\par
Visual Axis: Visual axis is the line joining the Gaze or fixation(O), nodal point (N), and the fovea (F). Drishti as Retina: Drishti is made up of sara of Panchamahabhoot, but Teja mahabhoot is predominant in the form of Alochaka Pitta which is considered as light media for eye. Roopa with the help of teja travels into chakshu and then reached to chaksurendriya and then to chakshubudhhi where perception of the object occurs and finally perceived by atma which provide information of the object and all this can be considered as pathway for visual impulse received by eyes and thus enabling it to see.\par
Indriyaartha (object has form) Indriyadravya (light media)Indriyaadhisthana (eyes)\par
Indriya (photoreceptor cells of retina (rods and cones)\par
Indriyabuddhi (transmission of image via visual pathway)\par
Atma (higher centre i.e. visual cortex) 
\section[{d) Concept of physiological aspect of drishti}]{d) Concept of physiological aspect of drishti}\par
Patalas are the main seat for the disease where the feature is impairment in vision. It may blurred vision for distance or near, metamorphopsia, diplopia and visual field defects. Acharya Bhela has described two types of alochaka pitta-1. Chaksyu vaisheshika -The former is responsible for proper formation of image on the retina and transmission of impulses (conditions wherein the media of the eye and retina is involved). 
\section[{Buddhi vaisheshika (Higher visual center-image}]{Buddhi vaisheshika (Higher visual center-image}\par
analysed and perceived by buddhi)  {\ref 26} . 
\section[{e) Concept of pathological aspects of drishti}]{e) Concept of pathological aspects of drishti}\par
The diagnosis of a disease with impairment in the vision is based only on the symptoms. When prathama and dwiteeya patala is invaded by the doshas, it is called as timira, triteeya patala is kacha and chaturtha patala is linganasha. These timira, kacha, linganasha are the progressive stages of a disease which starts with the blurring of vision, ending with complete loss of vision. Clinical application of concept of drishti Myopia: characterised by blurring of vision for distant objects 27 . This feature is seen in pratama patalagata dosha lakshana. Dosha is vata. Hence, vatajatimira line of management should be followed. Presbyopia is difficulty in near vision seen as a symptom in dwiteeya patalagata dosha. Dosha involved is vata. Vitreous degeneration, floaters are seen. This feature is seen in dwiteeya patalagata lakshana. Dosha is vata (responsible for degeneration). Diplopia wherein there will be double vision is seen as triteeya patalagata lakshana. Metamorphopsia which is seen in many conditions where there is distortion of vision 28 . This feature is seen in triteeya patalagata dosha lakshana (karna nasa kshi yuktani viparitani ca veekshyate). Dosha can be either vata or pitta. Visual field defects characterized by different pattern of vision loss. The pattern of visual field defect corresponds to the site of lesion in the visual pathway. For instance, if nasal fibres of right eye are affected it leads right temporal visual field defect  {\ref 29} . In triteeya patalagata dosha, depending on the lodgement of dosha the corresponding side of vision will not be seen. For example, if the doshas are situated in the side of drishti then lateral part of field of vision is lost. This is seen as triteeya patalagata lakshana and also in sannipataja timira. Hence, sannipataja timira line of management should be followed. Conditions where in the patient is said to be legally blind, conditionswhere there is retinal traction leading to flashes. 
\section[{IV.}]{IV.} 
\section[{Discussion}]{Discussion}\par
In Ayurveda, Drishti is used as a broad terminology and is used accordingly in different aspects.\par
From the present study it can be concluded that Drishti is not just a single entity but composed of many structures that can be correlated in modern ophthalmology. The structures which come across visual axis and their functional output in total can be taken as Drishti. In view of this definition the structures i.e. central part of Cornea, Pupil, Lens, Vitreous, Retina, Visual pathway all come under the broad view of Drishti along with functional outcome i.e. vision. For treating the diseases related with Drishti there should be proper knowledge of different terminologies and their practical implementation so that the basic aim of Ayurveda-to maintain the health of healthy person and to cure the unhealthy person can be achieved. In Ayurveda, Drishti is used as a broad terminology and is used accordingly in different aspects. From the present study it can be concluded that Drishti is not just a single entity but composed of many structures that can be correlated in modern ophthalmology. In this literary study we collected various data from the deferent Ayurvedic scriptures with the available commentaries, as well as text books of modern medical sciences, various articles for better understanding of the netra sharir and its comparison with contemporary science. Acharyas have explained prakriti also has described the anatomy of eye in relation to their shape, size of various anatomical components. Sushruta has explained seventy-six different kinds of eye diseases and their treatment in uttara tantra. The Netra execute both physiological functions roopagrahana and buddhigrahana as it is the seat of Alochaka pitta. It is predominant of tejo mahabhuta so, there is always dread of kapha to eye.\par
V. 
\section[{Conclusion}]{Conclusion}\par
It is also said that all types of eye diseases originate from the Abhishyandha. Therefore, the wise doctor should first treat the disease Abhishyandha (Prayena sarve nayanaamyastu bhavantyaabhishandnimittamula)  {\ref 34} . The eye sees the images with the help of mind not by the eye (itself) and the eye dose not(actually) see the images when the mind is perturbed even if it (physically)sees them. It has to be understood what it implies in relation to where the word drishti is being used. As explained above, in context of anatomy it should be referred as pupil, in context of kanch, timir, linganaash (drishtigata rogas) it should be considered as intraocular lens whereas in pitta vidagdha drishti, shleshma vidagdha drishti etc. drishtigata rogas it must be taken as optic nerve or retina as a whole.\begin{figure}[htbp]
\noindent\textbf{12}\includegraphics[]{image-2.png}
\caption{\label{fig_0}Figure 1 :Figure 2 :}\end{figure}
 \begin{figure}[htbp]
\noindent\textbf{} \par 
\begin{longtable}{P{0.85\textwidth}}
b) Drishti in Physiological Point of View-\\
Properties of Drishti-cold atmosphere (Sheet satmya).\\
Drishti as knowledge-Drishti visharada is a term used\\
for having extreme knowledgeable person.\\
Drishti as Vision-In Ayurvedic classics there are several\\
references which indicate that\\
Drishti term is used for vision. Few textual references are\\
as following\\
? When Tejo Dhatu does not reach Drishti, congenital\\
blindness (Jatyandha) is developed 17 .\end{longtable} \par
  {\small\itshape [Note: ? If poison is given in Anjana form (Visha Samsrishta Anjana) then blurring of vision (Drishti vibhrama) occurs 18 . ? Controlling vega (natural urges) like Kshudha and Adhovayu leads to defective vision 19,20 . ? If Adhimantha is not treated properly it leads to loss of vision (Drishtihanana) 21 .]} 
\caption{\label{tab_1}}\end{figure}
 \begin{figure}[htbp]
\noindent\textbf{} \par 
\begin{longtable}{P{0.007830092118730808\textwidth}P{0.03480040941658137\textwidth}P{0.4767656090071648\textwidth}P{0.01653019447287615\textwidth}P{0.0017400204708290685\textwidth}P{0.00609007164790174\textwidth}P{0.2235926305015353\textwidth}P{0.03915046059365405\textwidth}P{0.04350051177072672\textwidth}}
S.No.\tabcellsep Patalas\tabcellsep \tabcellsep \multicolumn{3}{l}{Lakshana}\tabcellsep Interpretation of Symptoms and signs\\
1\tabcellsep Prathama\tabcellsep \multicolumn{4}{l}{Disturbance in vision 30}\tabcellsep Blurred of vision\\
2\tabcellsep Dwiteeya\tabcellsep \multicolumn{4}{l}{Patient sees objects like}\tabcellsep Floaters, metamorphopsia, photopsia, loss of depth\\
\tabcellsep \tabcellsep \multicolumn{4}{l}{insects, hairs and webs, unable}\tabcellsep perception and presbyopia\\
\tabcellsep \tabcellsep \multicolumn{4}{l}{to perceive certain parts in a}\\
\tabcellsep \tabcellsep \multicolumn{4}{l}{face, sees certain luminous}\\
\tabcellsep \tabcellsep \multicolumn{4}{l}{objects like stars, objects which}\\
\tabcellsep \tabcellsep \multicolumn{4}{l}{are near appears to be far and}\\
\tabcellsep \tabcellsep \multicolumn{4}{l}{vice versa, unable to thread a}\\
\tabcellsep \tabcellsep \multicolumn{2}{l}{needle 31 .}\tabcellsep \\
3\tabcellsep Triteeya\tabcellsep \multicolumn{4}{l}{There will be raga prapthi -}\tabcellsep Visual pathway defects, retinal tear or detachment,\\
\tabcellsep \tabcellsep different\tabcellsep \multicolumn{3}{l}{colours}\tabcellsep will\tabcellsep be\tabcellsep metamorphopsia. Raga prapthi to the patalas as any\\
\tabcellsep \tabcellsep \multicolumn{2}{l}{imparted}\tabcellsep to\tabcellsep the\tabcellsep patalas\tabcellsep change in the general back ground. Example:\\
\tabcellsep \tabcellsep \multicolumn{4}{l}{corresponding to the dosha}\tabcellsep vitreous haemorrhage -as pittaja, Retinitis\\
\tabcellsep \tabcellsep \multicolumn{4}{l}{involved. Vatadosha -reddish}\tabcellsep pigmentosa as vataja.\\
\tabcellsep \tabcellsep \multicolumn{4}{l}{black, pitta -yellow or blue,}\\
\tabcellsep \tabcellsep \multicolumn{4}{l}{kapha -white, rakta -red,}\\
\tabcellsep \tabcellsep \multicolumn{4}{l}{sannipataja as multiple colours}\\
\tabcellsep \tabcellsep \multicolumn{4}{l}{and parimlayi as yellow, red or}\\
\tabcellsep \tabcellsep blue 32 .\tabcellsep \tabcellsep \\
4\tabcellsep Chaturtha\tabcellsep \multicolumn{4}{l}{Complete loss of vision but still}\\
\tabcellsep \tabcellsep \multicolumn{4}{l}{the patient sees bright objects}\\
\tabcellsep \tabcellsep like\tabcellsep sun,\tabcellsep \tabcellsep moon\tabcellsep and\\
\tabcellsep \tabcellsep \multicolumn{3}{l}{Lightening 33 .}\end{longtable} \par
 
\caption{\label{tab_3}}\end{figure}
 		 		\backmatter  			 			 			  				\begin{bibitemlist}{1}
\bibitem[Pt. Rajeshwardatta Shastri ()]{b0}\label{b0} 	 		\textit{},  	 	 		\textit{Chaukhambha Bharati Academy Gokul Bhawan Varanasi}  		Pt. Rajeshwardatta Shastri (ed.)  		2017. Sutrasthana 30/26. 1 p. 589.  	 
\bibitem[Shastri Ambikadutta Aupdravikam Adhyaya (ed.) ()]{b1}\label{b1} 	 		\textit{Ayurveda Tattva Sandipika Hindi Commentary Susruta Samhita Uttaratantra 2013 reprint edition Chaukhambha Sanskrit Sansthan},  				 			Kaviraj Shastri Ambikadutta Aupdravikam Adhyaya 		 (ed.)  		 (Varanasi)  		2013. p. .  	 
\end{bibitemlist}
 			 		 	 
\end{document}