>>> Many years ago, someone who used to work for me was struggling with poor memory. He wanted to be alert and disciplined but it was almost like laziness was a disease and he was suffering from it. Not in the physical sense because he was out and about working on stuff all the time but there was no productivity, focus or any significant output. We (him and I) figured he severely lacked focus.
I told him to practice trataka for three months every day. It would help him with his memory and focus. He followed the instructions diligently and at the end of three months, there was remarkable improvement in his memory and recall. But, memory improvement wasn’t the main thing. As a result of the practice, another, totally
unexpected, thing happened. He reported a blurred vision in spite of wearing spectacles. He went to the optometrist only to find out that he no longer needed the prescription glasses (for short-sightedness or myopia). He had been wearing glasses for more than a decade.
I’ve observed on numerous occasions that yogic practices do channelize the flow of various energies in the body. It changes your gaze, gait and movements. It even affects your speech in its own positive way. You slow down a bit but become more effective, more mindful.
An unfailing sign of a true yogi is stillness of the gaze. Even some advanced meditators struggle to keep their eyeballs still (even when their eyes are closed). Stillness of the gaze has a remarkable effect on the energy flow in your body.
There is a specific yogic practice to perfect your gaze. The method of fixing your gaze on an object is called trāṭaka.
Movement in the eyes, flickering of the eyelids represent a subtle flaw in your posture as well as meditation. Practice of trataka is the best practice to eliminate this flaw. Like all other yogic practices, do it every day for at least 40 days to benefit from it.
Excerpted from: https://www.amazon.com/Million-Thoughts-Meditation-Himalayan...
How would you describe a state of mind in which you remain thoughtless as long as you want? Thoughts will only arrive in your conscious mind when you summon them and you can hold a thought as long as you want. You remain perfectly peaceful, tranquil without blabbering and urges of the mind without exerting as in meditation. Meditation is no longer an act but a state of your mind.
When your mind is perfectly under control without effort, you have become awakened (or enlightened), because now you truly possess a free will in the truest sense of the word. Earlier when your mind was in control, your innate tendencies were driving your actions, based on external stimuli. Anger, greed, lust, envy, fear and other negative emotions thrive in such a state of mind naturally and one has to exert to check them.
I'd urge you to try concentrative meditation, wherein one tries to hold a thought (could be visualizing a form, or listening to a sound ETC) and see the power of conditioned mind. Observe how long you can hold it. For instance, if you're visualizing a form, you may discover that within matter of few seconds it starts fading, dancing or completely gone. Similarly If you are meditating on sound, you will find that within few seconds your mind has distracted and you have to exert to retain your focus. The mind is not in your control and such a conditioned mind can form opinions and dilute you. But an enlightened mind, perfectly in control cannot have delusion and ever lives in present moment. Opinions and judgement are tools of a conditioned mind, ever fearful and constantly striving to ensure survival of the body.
That said, I'm not yet an enlightened being; I'm striving for it by walking path of meditation, kindness and chanting . I do have experiences and glimses confirming most of what I've written, but I have not attained the final state yet. If you're truly curious and want to read, learn and practice more about this, I'd encourage you to read Om Swami's books. The one on meditation  takes you through the journey of a meditator with states and stages of mind and awareness that you'll find intriguing and hopefully interesting to pursue. Simple yet precise methods and practices have been given along with a method to measure one's progress.
0: I use Black Lotus app for logging and measuring my meditation and chanting sessions as well as random acts of kindness (RAKs) (https://play.google.com/store/apps/details?id=com.rt.pinpric...) - inspired by same author
I alternate between sound (mantra) and form, and sometimes formless as well .
Ke to do concentrative meditation can be summed up in one line (taken from )
“Exert when relaxed and relax when exerted.”
As one walks the path, one invariably goes through these nine states of awareness: http://omswami.com/2015/02/nine-states-awareness.html
The rewards of concentrative meditation are huge. But most of them requires intense effort eventually .
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