Make dots flash in html canvas

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I would like to make dots flash off in html canvas. Here is the code in which I tried by reducing the radius of the dot to zero. But it seems to be happening too fast to see it. Is there any way around this?

<!DOCTYPE html>
<html>
 <head>

  <meta charset="utf-8"/>
  <script type="application/javascript">
  var xdots = [];
  var ydots = [];
  function getRandomInt(max) {
    return Math.floor(Math.random() * max);
  }

  var t = getRandomInt(10);

    function draw() { crosshairlength;
var lengthyminus = crosshairlength;
var lengthyplus = crosshairlength;

ctx.moveTo((x/2)-lengthxminus, y/2);
ctx.lineTo((x/2)+lengthxplus, y/2);

//horizontal line
ctx.moveTo((x/2)-
      const canvas = document.getElementById('canvas');
      if (canvas.getContext) {
        const ctx = canvas.getContext('2d');
        var x = canvas.width;
        var y = canvas.height;

        setInterval(myTimer, t*100);

      function myTimer() {

ctx.beginPath();

var ret = 1000;
function radius() {
  for (let i=1;i<=10;i++) {

    ret = 10-i;
console.log(ret + ' =10-' + i);
}
  return ret;
}
ctx.fillStyle = '#0000'; //black
var crosshairlength = 20;
var lengthxminus = crosshairlength;
var lengthxplus = crosshairlength;
var lengthyminus = crosshairlength;
var lengthyplus = crosshairlength;

ctx.moveTo((x/2)-lengthxminus, y/2);
ctx.lineTo((x/2)+lengthxplus, y/2);

//horizontal line
ctx.moveTo((x/2)-lengthxminus, y/2);
ctx.lineTo((x/2)+lengthxplus, y/2);

//vertical line
ctx.moveTo(x/2, (y/2)-lengthyminus);
ctx.lineTo(x/2, (y/2)+lengthyplus);
ctx.strokeStyle ='#000000';


ctx.stroke();

var w = getRandomInt(x);
var h = getRandomInt(y);<!DOCTYPE html>
<html>
 <head>

  <meta charset="utf-8"/>
  <script type="application/javascript">
  var xdots = [];
  var ydots = [];
  function getRandomInt(max) {
    return Math.floor(Math.random() * max);
  }

  var t = getRandomInt(10);

    function draw() { crosshairlength;
var lengthyminus = crosshairlength;
var lengthyplus = crosshairlength;

ctx.moveTo((x/2)-lengthxminus, y/2);
ctx.lineTo((x/2)+lengthxplus, y/2);

//horizontal line
ctx.moveTo((x/2)-
      const canvas = document.getElementById('canvas');
      if (canvas.getContext) {
        const ctx = canvas.getContext('2d');
        var x = canvas.width;
        var y = canvas.height;

        setInterval(myTimer, t*100);

      function myTimer() {

ctx.beginPath();

var ret = 1000;
function radius() {
  for (let i=1;i<=10;i++) {

    ret = 10-i;
console.log(ret + ' =10-' + i);
}
  return ret;
}
ctx.fillStyle = '#0000'; //black
var crosshairlength = 20;
var lengthxminus = crosshairlength;
var lengthxplus = crosshairlength;
var lengthyminus = crosshairlength;
var lengthyplus = crosshairlength;

ctx.moveTo((x/2)-lengthxminus, y/2);
ctx.lineTo((x/2)+lengthxplus, y/2);

//horizontal line
ctx.moveTo((x/2)-lengthxminus, y/2);
ctx.lineTo((x/2)+lengthxplus, y/2);

//vertical line
ctx.moveTo(x/2, (y/2)-lengthyminus);
ctx.lineTo(x/2, (y/2)+lengthyplus);
ctx.strokeStyle ='#000000';


ctx.stroke();

var w = getRandomInt(x);
var h = getRandomInt(y);

w.push(xdots);
h.push(ydots);

ctx.beginPath();
ctx.fillStyle = "blue"; //blue
ctx.arc(w,h,radius(),0,Math.PI*2);
ctx.fill();

//Clear top left corner
ctx.beginPath();
ctx.fillStyle = "white"; //white
ctx.fillRect(0,0,x/2-lengthxminus,y/2-lengthyminus);
ctx.fill();
   }
}
}
  </script>
 </head>
<h1>Peripheral vision checker</h1>
 <body onload="draw();">
   <canvas id="canvas" width="1846" height="768"></canvas>

 </body>
</html>


w.push(xdots);
h.push(ydots);

ctx.beginPath();
ctx.fillStyle = "blue"; //blue
ctx.arc(w,h,radius(),0,Math.PI*2);
ctx.fill();

//Clear top left corner
ctx.beginPath();
ctx.fillStyle = "white"; //white
ctx.fillRect(0,0,x/2-lengthxminus,y/2-lengthyminus);
ctx.fill();
   }
}
}
  </script>
 </head>
<h1>Peripheral vision checker</h1>
 <body onload="draw();">
   <canvas id="canvas" width="1846" height="768"></canvas>

 </body>
</html>


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