27. The appreciation of ocular evidence is a hard task. There is no fixed or straight-jacket formula for appreciation of the ocular evidence. The judicially evolved principles for appreciation of ocular evidence in a criminal case can be enumerated as under:

1. While appreciating the evidence of a witness, the approach must be whether the evidence of the witness read as a whole appears to have a ring of truth. Once that impression is formed, it is undoubtedly necessary for the Court to scrutinize the evidence more particularly keeping in view the deficiencies, drawbacks and infirmities pointed out in the evidence as a whole and evaluate them to find out whether it is against the general tenor of the evidence given by the witness and whether the earlier evaluation of the evidence is shaken as to render it unworthy of belief.
2. If the Court before whom the witness gives evidence had the opportunity to form the opinion about the general tenor of evidence given by the witness, the appellate court which had not this benefit will have to attach due weight to the appreciation of evidence by the trial court and unless there are reasons weighty and formidable it would not be proper to reject the evidence on the ground of minor variations or infirmities in the matter of trivial details.
3. When eye-witness is examined at length it is quite possible for him to make some discrepancies. But courts should bear in mind that it is only when discrepancies in the evidence of a witness are so incompatible with the credibility of his version that the court is justified in jettisoning his evidence.
4. Minor discrepancies on trivial matters not touching the core of the case, hyper-technical approach by taking sentences torn out of context here or there from the evidence, attaching importance to some technical error committed by the investigating officer not going to the root of the matter would not ordinarily permit rejection of the evidence as a whole.
5. Too serious a view to be adopted on mere variations falling in the narration of an incident (either as between the evidence of two witnesses or as between two statements of the same witness) is an unrealistic approach for judicial scrutiny.
6. By and large a witness cannot be expected to possess a photographic memory and to recall the details of an incident. It is not as if a video tape is replayed on the mental screen.
7. Ordinarily it so happens that a witness is overtaken by events. The witness could not have anticipated the occurrence which so often has an element of surprise. The mental faculties therefore cannot be expected to be attuned to absorb the details.
8. The powers of observation differ from person to person. What one may notice, another may not. An object or movement might emboss its image on one person’s mind whereas it might go unnoticed on the part of another.
9. By and large people cannot accurately recall a conversation and reproduce the very words used by them or heard by them. They can only recall the main purport of the conversation. It is unrealistic to expect a witness to be a human tape recorder.
10. In regard to exact time of an incident, or the time duration of an occurrence, usually, people make their estimates by guess work on the spur of the moment at the time of interrogation. And one cannot expect people to make very precise or reliable estimates in such matters. Again, it depends on the time-sense of individuals which varies from person to person.
11. Ordinarily a witness cannot be expected to recall accurately the sequence of events which take place in rapid succession or in a short time span. A witness is liable to get confused, or mixed up when interrogated later on.
12. A witness, though wholly truthful, is liable to be overawed by the court atmosphere and the piercing cross-examination by counsel and out of nervousness mix up facts, get confused regarding sequence of events, or fill up details from imagination on the spur of the moment. The subconscious mind of the witness sometimes so operates on account of the fear of looking foolish or being disbelieved though the witness is giving a truthful and honest account of the occurrence witnessed by him.
13. A former statement though seemingly inconsistent with the evidence need not necessarily be sufficient to amount to contradiction. Unless the former statement has the potency to discredit the later statement, even if the later statement is at variance with the former to some extent it would not be helpful to contradict that witness. [See Bharwada Bhoginbhai Hirjibhai v. State of Gujarat, 1983 Cri LJ 1096 : AIR 1983 SC 753, Leela Ram v. State of Haryana, AIR 1999 SC 3717, and Tahsildar Singh v. State of UP, AIR 1959 SC 1012]