NEAR POINT OF CONVERGENCE | How to measure NPC

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This video describes how to measure NPC in details, both subjective and objective
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Mam i am having eye strain problem and eye muscles is weak i have shown to sankar netralya new town to sunita pandey mam she told me to go for orthoptics review 5 months ago they have given me flipper, eccentric circle transparent and opaque both eye execsise i am doing it regularly but now also strain in coming on eye so mam please tell me where i should go for orthoptics eveulation for good result in city like patna it is close to my house

shreyakumari